Simplifying
y + -13x = 9
Reorder the terms:
-13x + y = 9
Solving
-13x + y = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1y' to each side of the equation.
-13x + y + -1y = 9 + -1y
Combine like terms: y + -1y = 0
-13x + 0 = 9 + -1y
-13x = 9 + -1y
Divide each side by '-13'.
x = -0.6923076923 + 0.07692307692y
Simplifying
x = -0.6923076923 + 0.07692307692y