-2(r+4)-(r-5)=-12

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Solution for -2(r+4)-(r-5)=-12 equation:


Simplifying
-2(r + 4) + -1(r + -5) = -12

Reorder the terms:
-2(4 + r) + -1(r + -5) = -12
(4 * -2 + r * -2) + -1(r + -5) = -12
(-8 + -2r) + -1(r + -5) = -12

Reorder the terms:
-8 + -2r + -1(-5 + r) = -12
-8 + -2r + (-5 * -1 + r * -1) = -12
-8 + -2r + (5 + -1r) = -12

Reorder the terms:
-8 + 5 + -2r + -1r = -12

Combine like terms: -8 + 5 = -3
-3 + -2r + -1r = -12

Combine like terms: -2r + -1r = -3r
-3 + -3r = -12

Solving
-3 + -3r = -12

Solving for variable 'r'.

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

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

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

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

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

Simplifying
r = 3

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