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Simplifying -120 = -8(5 + -2r) -120 = (5 * -8 + -2r * -8) -120 = (-40 + 16r) Solving -120 = -40 + 16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16r' to each side of the equation. -120 + -16r = -40 + 16r + -16r Combine like terms: 16r + -16r = 0 -120 + -16r = -40 + 0 -120 + -16r = -40 Add '120' to each side of the equation. -120 + 120 + -16r = -40 + 120 Combine like terms: -120 + 120 = 0 0 + -16r = -40 + 120 -16r = -40 + 120 Combine like terms: -40 + 120 = 80 -16r = 80 Divide each side by '-16'. r = -5 Simplifying r = -5
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