inf = 10**30
# b > c > a 
def calc1(a,b,c,x,y,z):
    l = [a,b,c]
    count = [0,0,0]
    if a >= c:
        count[2] += (a-c+1)*z
        c = a+1
    if c >= b:
        count[1] += (c-b+1)*y
        b = c+1
    
    for i in range(3):
        for j in range(3):
            if i == j:
                continue
            l[j] -= count[i]
    if min(l) > 0:
        return sum(count)
    return inf

# c > a > b
def calc2(a,b,c,x,y,z):
   
    l = [a,b,c]
    count = [0,0,0]
    if b >= a:
        count[0] += (b-a+1)*x
        a = b+1
    if a >= c:
        count[2] += (a-c+1)*z
        c = a+1
    
    for i in range(3):
        for j in range(3):
            if i == j:
                continue
            l[j] -= count[i]
    if min(l) > 0:
        return sum(count)
    return inf

t = int(input())
for _ in range(t):
    a,b,c,x,y,z = map(int,input().split())
    x,y,z = z,x,y
    ans = min(calc1(a,b,c,x,y,z),calc2(a,b,c,x,y,z),calc1(c,b,a,z,y,x),calc2(c,b,a,z,y,x))
    if ans == inf:
        ans = -1
    print(ans)