-81=b-3(7-3b)

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Solution for -81=b-3(7-3b) equation:


Simplifying
-81 = b + -3(7 + -3b)
-81 = b + (7 * -3 + -3b * -3)
-81 = b + (-21 + 9b)

Reorder the terms:
-81 = -21 + b + 9b

Combine like terms: b + 9b = 10b
-81 = -21 + 10b

Solving
-81 = -21 + 10b

Solving for variable 'b'.

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

Add '-10b' to each side of the equation.
-81 + -10b = -21 + 10b + -10b

Combine like terms: 10b + -10b = 0
-81 + -10b = -21 + 0
-81 + -10b = -21

Add '81' to each side of the equation.
-81 + 81 + -10b = -21 + 81

Combine like terms: -81 + 81 = 0
0 + -10b = -21 + 81
-10b = -21 + 81

Combine like terms: -21 + 81 = 60
-10b = 60

Divide each side by '-10'.
b = -6

Simplifying
b = -6

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