r=3(b-7)

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


Simplifying
r = 3(b + -7)

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

Solving
r = -21 + 3b

Solving for variable 'r'.

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

Simplifying
r = -21 + 3b

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