maths homework help pleasssee! make b the subject g=5- 4a/b make z the subject x= y/(2+z) make b the subject w-1=5a / 1+b THANKS?

make b the subject
g = 5 - (4a/b)
4a/b = 5 - g
b(5 - g) = 4a
5b - bg = 4a
bg = 5b - 4a
g = (5b - 4a)/b


make z the subject
x= y/(2+z)
x(2 + z) = y
2x + xz = y
xz = y - 2x
z = (y - 2x)/x


make b the subject
w - 1 = 5a / (1 + b)
(w - 1)(1 + b) = 5a
1 + b = 5a/(w - 1)
b = [5a/(w - 1)] - 1
b = [5a - (w - 1)] / (w - 1)
b = (5a - w + 1) / (w - 1)