81=10b-7-21b

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Solution for 81=10b-7-21b equation:


Simplifying
81 = 10b + -7 + -21b

Reorder the terms:
81 = -7 + 10b + -21b

Combine like terms: 10b + -21b = -11b
81 = -7 + -11b

Solving
81 = -7 + -11b

Solving for variable 'b'.

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

Add '11b' to each side of the equation.
81 + 11b = -7 + -11b + 11b

Combine like terms: -11b + 11b = 0
81 + 11b = -7 + 0
81 + 11b = -7

Add '-81' to each side of the equation.
81 + -81 + 11b = -7 + -81

Combine like terms: 81 + -81 = 0
0 + 11b = -7 + -81
11b = -7 + -81

Combine like terms: -7 + -81 = -88
11b = -88

Divide each side by '11'.
b = -8

Simplifying
b = -8

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