local t = io.read("*n")
for it = 1, t do
  local a, b, c = io.read("*n", "*n", "*n")
  local x, y, z = io.read("*n", "*n", "*n")
  local inf = 1000000007LL * 1000000007LL
  local ret = inf
  do
    -- b < a < c
    local ta, tb, tc = a, b, c
    local cost = 0LL
    if tc <= ta then
      cost = cost + x * (ta + 1 - tc)
      ta = tc - 1
    end
    if ta <= tb then
      cost = cost + y * (tb + 1 - ta)
      tb = ta - 1
    end
    if 0 < tb and cost < ret then ret = cost end
  end
  do
    -- b < c < a
    local ta, tb, tc = a, b, c
    local cost = 0LL
    if ta <= tc then
      cost = cost + z * (tc + 1 - ta)
      tc = ta - 1
    end
    if tc <= tb then
      cost = cost + y * (tb + 1 - tc)
      tb = tc - 1
    end
    if 0 < tb and cost < ret then ret = cost end
  end
  do
    -- a < c < b
    local ta, tb, tc = a, b, c
    local cost = 0LL
    if tb <= tc then
      cost = cost + z * (tc + 1 - tb)
      tc = tb - 1
    end
    if tc <= ta then
      cost = cost + x * (ta + 1 - tc)
      ta = tc - 1
    end
    if 0 < ta and cost < ret then ret = cost end
  end
  do
    -- c < a < b
    local ta, tb, tc = a, b, c
    local cost = 0LL
    if tb <= ta then
      cost = cost + x * (ta + 1 - tb)
      ta = tb - 1
    end
    if ta <= tc then
      cost = cost + z * (tc + 1 - ta)
      tc = ta - 1
    end
    if 0 < tc and cost < ret then ret = cost end
  end
  if ret == inf then
    print(-1)
  else
    local str = tostring(ret):gsub("LL", "")
    print(str)
  end
end