12(7r+13)=-2(3r+12)

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Solution for 12(7r+13)=-2(3r+12) equation:


Simplifying
12(7r + 13) = -2(3r + 12)

Reorder the terms:
12(13 + 7r) = -2(3r + 12)
(13 * 12 + 7r * 12) = -2(3r + 12)
(156 + 84r) = -2(3r + 12)

Reorder the terms:
156 + 84r = -2(12 + 3r)
156 + 84r = (12 * -2 + 3r * -2)
156 + 84r = (-24 + -6r)

Solving
156 + 84r = -24 + -6r

Solving for variable 'r'.

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

Add '6r' to each side of the equation.
156 + 84r + 6r = -24 + -6r + 6r

Combine like terms: 84r + 6r = 90r
156 + 90r = -24 + -6r + 6r

Combine like terms: -6r + 6r = 0
156 + 90r = -24 + 0
156 + 90r = -24

Add '-156' to each side of the equation.
156 + -156 + 90r = -24 + -156

Combine like terms: 156 + -156 = 0
0 + 90r = -24 + -156
90r = -24 + -156

Combine like terms: -24 + -156 = -180
90r = -180

Divide each side by '90'.
r = -2

Simplifying
r = -2

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