s+42=3s

Solution for s+42=3s equation:

Simplifying
s + 42 = 3s

Reorder the terms:
42 + s = 3s

Solving
42 + s = 3s

Solving for variable 's'.

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

Add '-3s' to each side of the equation.
42 + s + -3s = 3s + -3s

Combine like terms: s + -3s = -2s
42 + -2s = 3s + -3s

Combine like terms: 3s + -3s = 0
42 + -2s = 0

Add '-42' to each side of the equation.
42 + -42 + -2s = 0 + -42

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

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

Divide each side by '-2'.
s = 21

Simplifying
s = 21