-3(5b+7)=21-b

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Solution for -3(5b+7)=21-b equation:


Simplifying
-3(5b + 7) = 21 + -1b

Reorder the terms:
-3(7 + 5b) = 21 + -1b
(7 * -3 + 5b * -3) = 21 + -1b
(-21 + -15b) = 21 + -1b

Solving
-21 + -15b = 21 + -1b

Solving for variable 'b'.

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

Add 'b' to each side of the equation.
-21 + -15b + b = 21 + -1b + b

Combine like terms: -15b + b = -14b
-21 + -14b = 21 + -1b + b

Combine like terms: -1b + b = 0
-21 + -14b = 21 + 0
-21 + -14b = 21

Add '21' to each side of the equation.
-21 + 21 + -14b = 21 + 21

Combine like terms: -21 + 21 = 0
0 + -14b = 21 + 21
-14b = 21 + 21

Combine like terms: 21 + 21 = 42
-14b = 42

Divide each side by '-14'.
b = -3

Simplifying
b = -3

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