21b-9+2b-b=-87

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Solution for 21b-9+2b-b=-87 equation:


Simplifying
21b + -9 + 2b + -1b = -87

Reorder the terms:
-9 + 21b + 2b + -1b = -87

Combine like terms: 21b + 2b = 23b
-9 + 23b + -1b = -87

Combine like terms: 23b + -1b = 22b
-9 + 22b = -87

Solving
-9 + 22b = -87

Solving for variable 'b'.

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

Add '9' to each side of the equation.
-9 + 9 + 22b = -87 + 9

Combine like terms: -9 + 9 = 0
0 + 22b = -87 + 9
22b = -87 + 9

Combine like terms: -87 + 9 = -78
22b = -78

Divide each side by '22'.
b = -3.545454545

Simplifying
b = -3.545454545

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