42=b-9

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Solution for 42=b-9 equation:


Simplifying
42 = b + -9

Reorder the terms:
42 = -9 + b

Solving
42 = -9 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
42 + -1b = -9 + b + -1b

Combine like terms: b + -1b = 0
42 + -1b = -9 + 0
42 + -1b = -9

Add '-42' to each side of the equation.
42 + -42 + -1b = -9 + -42

Combine like terms: 42 + -42 = 0
0 + -1b = -9 + -42
-1b = -9 + -42

Combine like terms: -9 + -42 = -51
-1b = -51

Divide each side by '-1'.
b = 51

Simplifying
b = 51

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