-3(2b-7)=-36+21-3b

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Solution for -3(2b-7)=-36+21-3b equation:


Simplifying
-3(2b + -7) = -36 + 21 + -3b

Reorder the terms:
-3(-7 + 2b) = -36 + 21 + -3b
(-7 * -3 + 2b * -3) = -36 + 21 + -3b
(21 + -6b) = -36 + 21 + -3b

Combine like terms: -36 + 21 = -15
21 + -6b = -15 + -3b

Solving
21 + -6b = -15 + -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
21 + -6b + 3b = -15 + -3b + 3b

Combine like terms: -6b + 3b = -3b
21 + -3b = -15 + -3b + 3b

Combine like terms: -3b + 3b = 0
21 + -3b = -15 + 0
21 + -3b = -15

Add '-21' to each side of the equation.
21 + -21 + -3b = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -3b = -15 + -21
-3b = -15 + -21

Combine like terms: -15 + -21 = -36
-3b = -36

Divide each side by '-3'.
b = 12

Simplifying
b = 12

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