3(1+7b)+2=-142

Solution for 3(1+7b)+2=-142 equation:

Simplifying
3(1 + 7b) + 2 = -142
(1 * 3 + 7b * 3) + 2 = -142
(3 + 21b) + 2 = -142

Reorder the terms:
3 + 2 + 21b = -142

Combine like terms: 3 + 2 = 5
5 + 21b = -142

Solving
5 + 21b = -142

Solving for variable 'b'.

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

Add '-5' to each side of the equation.
5 + -5 + 21b = -142 + -5

Combine like terms: 5 + -5 = 0
0 + 21b = -142 + -5
21b = -142 + -5

Combine like terms: -142 + -5 = -147
21b = -147

Divide each side by '21'.
b = -7

Simplifying
b = -7