15(3r+9)=12(4r-1)

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Solution for 15(3r+9)=12(4r-1) equation:


Simplifying
15(3r + 9) = 12(4r + -1)

Reorder the terms:
15(9 + 3r) = 12(4r + -1)
(9 * 15 + 3r * 15) = 12(4r + -1)
(135 + 45r) = 12(4r + -1)

Reorder the terms:
135 + 45r = 12(-1 + 4r)
135 + 45r = (-1 * 12 + 4r * 12)
135 + 45r = (-12 + 48r)

Solving
135 + 45r = -12 + 48r

Solving for variable 'r'.

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

Add '-48r' to each side of the equation.
135 + 45r + -48r = -12 + 48r + -48r

Combine like terms: 45r + -48r = -3r
135 + -3r = -12 + 48r + -48r

Combine like terms: 48r + -48r = 0
135 + -3r = -12 + 0
135 + -3r = -12

Add '-135' to each side of the equation.
135 + -135 + -3r = -12 + -135

Combine like terms: 135 + -135 = 0
0 + -3r = -12 + -135
-3r = -12 + -135

Combine like terms: -12 + -135 = -147
-3r = -147

Divide each side by '-3'.
r = 49

Simplifying
r = 49

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