Question

What is 3x-7y=z for x

Answer 1

x=7/3y+1/3z , answer

Answer 2

We want to find x in times of y and z, so we want to have only 1 x on the LHS of equation, so
3x-7y=z /+7z (add 7z both sides)
3x=z+7z /:3 (divide 3 both sides)

`x= (z+7y)/(3)` - its the result.