b-3b-42=0

Solution for b-3b-42=0 equation:

Simplifying
b + -3b + -42 = 0

Reorder the terms:
-42 + b + -3b = 0

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

Solving
-42 + -2b = 0

Solving for variable 'b'.

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

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

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

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

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

Simplifying
b = -21