Simplifying
8 + -3x + -1x = 12
Combine like terms: -3x + -1x = -4x
8 + -4x = 12
Solving
8 + -4x = 12
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + -4x = 12 + -8
Combine like terms: 8 + -8 = 0
0 + -4x = 12 + -8
-4x = 12 + -8
Combine like terms: 12 + -8 = 4
-4x = 4
Divide each side by '-4'.
x = -1
Simplifying
x = -1
Please mark brainliest if I helped!