7(3r+9)=12(2r-1)

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Solution for 7(3r+9)=12(2r-1) equation:


Simplifying
7(3r + 9) = 12(2r + -1)

Reorder the terms:
7(9 + 3r) = 12(2r + -1)
(9 * 7 + 3r * 7) = 12(2r + -1)
(63 + 21r) = 12(2r + -1)

Reorder the terms:
63 + 21r = 12(-1 + 2r)
63 + 21r = (-1 * 12 + 2r * 12)
63 + 21r = (-12 + 24r)

Solving
63 + 21r = -12 + 24r

Solving for variable 'r'.

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

Add '-24r' to each side of the equation.
63 + 21r + -24r = -12 + 24r + -24r

Combine like terms: 21r + -24r = -3r
63 + -3r = -12 + 24r + -24r

Combine like terms: 24r + -24r = 0
63 + -3r = -12 + 0
63 + -3r = -12

Add '-63' to each side of the equation.
63 + -63 + -3r = -12 + -63

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

Combine like terms: -12 + -63 = -75
-3r = -75

Divide each side by '-3'.
r = 25

Simplifying
r = 25

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