-12(1-r)+8(-2r-5)=0

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Solution for -12(1-r)+8(-2r-5)=0 equation:


Simplifying
-12(1 + -1r) + 8(-2r + -5) = 0
(1 * -12 + -1r * -12) + 8(-2r + -5) = 0
(-12 + 12r) + 8(-2r + -5) = 0

Reorder the terms:
-12 + 12r + 8(-5 + -2r) = 0
-12 + 12r + (-5 * 8 + -2r * 8) = 0
-12 + 12r + (-40 + -16r) = 0

Reorder the terms:
-12 + -40 + 12r + -16r = 0

Combine like terms: -12 + -40 = -52
-52 + 12r + -16r = 0

Combine like terms: 12r + -16r = -4r
-52 + -4r = 0

Solving
-52 + -4r = 0

Solving for variable 'r'.

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

Add '52' to each side of the equation.
-52 + 52 + -4r = 0 + 52

Combine like terms: -52 + 52 = 0
0 + -4r = 0 + 52
-4r = 0 + 52

Combine like terms: 0 + 52 = 52
-4r = 52

Divide each side by '-4'.
r = -13

Simplifying
r = -13

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