2(r+38)+12=42

Solution for 2(r+38)+12=42 equation:

Simplifying
2(r + 38) + 12 = 42

Reorder the terms:
2(38 + r) + 12 = 42
(38 * 2 + r * 2) + 12 = 42
(76 + 2r) + 12 = 42

Reorder the terms:
76 + 12 + 2r = 42

Combine like terms: 76 + 12 = 88
88 + 2r = 42

Solving
88 + 2r = 42

Solving for variable 'r'.

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

Add '-88' to each side of the equation.
88 + -88 + 2r = 42 + -88

Combine like terms: 88 + -88 = 0
0 + 2r = 42 + -88
2r = 42 + -88

Combine like terms: 42 + -88 = -46
2r = -46

Divide each side by '2'.
r = -23

Simplifying
r = -23