Answer:
Simplifying
x + 8y = 15
Solving
x + 8y = 15
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8y' to each side of the equation.
x + 8y + -8y = 15 + -8y
Combine like terms: 8y + -8y = 0
x + 0 = 15 + -8y
x = 15 + -8y
Simplifying
x = 15 + -8y