-3(b-5)=21

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Solution for -3(b-5)=21 equation:


Simplifying
-3(b + -5) = 21

Reorder the terms:
-3(-5 + b) = 21
(-5 * -3 + b * -3) = 21
(15 + -3b) = 21

Solving
15 + -3b = 21

Solving for variable 'b'.

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

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

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

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

Divide each side by '-3'.
b = -2

Simplifying
b = -2

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