42-3b=45

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Solution for 42-3b=45 equation: 


Simplifying
42 + -3b = 45

Solving
42 + -3b = 45

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 + -3b = 45 + -42

Combine like terms: 42 + -42 = 0
0 + -3b = 45 + -42
-3b = 45 + -42

Combine like terms: 45 + -42 = 3
-3b = 3

Divide each side by '-3'.
b = -1

Simplifying
b = -1

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