3(b+12)=81

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Solution for 3(b+12)=81 equation: 


Simplifying
3(b + 12) = 81

Reorder the terms:
3(12 + b) = 81
(12 * 3 + b * 3) = 81
(36 + 3b) = 81

Solving
36 + 3b = 81

Solving for variable 'b'.

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

Add '-36' to each side of the equation.
36 + -36 + 3b = 81 + -36

Combine like terms: 36 + -36 = 0
0 + 3b = 81 + -36
3b = 81 + -36

Combine like terms: 81 + -36 = 45
3b = 45

Divide each side by '3'.
b = 15

Simplifying
b = 15

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