-81=3(4b-7)

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Solution for -81=3(4b-7) equation:


Simplifying
-81 = 3(4b + -7)

Reorder the terms:
-81 = 3(-7 + 4b)
-81 = (-7 * 3 + 4b * 3)
-81 = (-21 + 12b)

Solving
-81 = -21 + 12b

Solving for variable 'b'.

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

Add '-12b' to each side of the equation.
-81 + -12b = -21 + 12b + -12b

Combine like terms: 12b + -12b = 0
-81 + -12b = -21 + 0
-81 + -12b = -21

Add '81' to each side of the equation.
-81 + 81 + -12b = -21 + 81

Combine like terms: -81 + 81 = 0
0 + -12b = -21 + 81
-12b = -21 + 81

Combine like terms: -21 + 81 = 60
-12b = 60

Divide each side by '-12'.
b = -5

Simplifying
b = -5

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