-3(b-7)=

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


Simplifying
-3(b + -7) = 0

Reorder the terms:
-3(-7 + b) = 0
(-7 * -3 + b * -3) = 0
(21 + -3b) = 0

Solving
21 + -3b = 0

Solving for variable 'b'.

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

Add '-21' to each side of the equation.
21 + -21 + -3b = 0 + -21

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

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

Divide each side by '-3'.
b = 7

Simplifying
b = 7

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