9(r+7)=12r

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Solution for 9(r+7)=12r equation:


Simplifying
9(r + 7) = 12r

Reorder the terms:
9(7 + r) = 12r
(7 * 9 + r * 9) = 12r
(63 + 9r) = 12r

Solving
63 + 9r = 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
63 + 9r + -12r = 12r + -12r

Combine like terms: 9r + -12r = -3r
63 + -3r = 12r + -12r

Combine like terms: 12r + -12r = 0
63 + -3r = 0

Add '-63' to each side of the equation.
63 + -63 + -3r = 0 + -63

Combine like terms: 63 + -63 = 0
0 + -3r = 0 + -63
-3r = 0 + -63

Combine like terms: 0 + -63 = -63
-3r = -63

Divide each side by '-3'.
r = 21

Simplifying
r = 21

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