4s+12-2s=42

Solution for 4s+12-2s=42 equation:

Simplifying
4s + 12 + -2s = 42

Reorder the terms:
12 + 4s + -2s = 42

Combine like terms: 4s + -2s = 2s
12 + 2s = 42

Solving
12 + 2s = 42

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Add '-12' to each side of the equation.
12 + -12 + 2s = 42 + -12

Combine like terms: 12 + -12 = 0
0 + 2s = 42 + -12
2s = 42 + -12

Combine like terms: 42 + -12 = 30
2s = 30

Divide each side by '2'.
s = 15

Simplifying
s = 15