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Simplifying -39 + 8r = 5(-3 + 4r) -39 + 8r = (-3 * 5 + 4r * 5) -39 + 8r = (-15 + 20r) Solving -39 + 8r = -15 + 20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20r' to each side of the equation. -39 + 8r + -20r = -15 + 20r + -20r Combine like terms: 8r + -20r = -12r -39 + -12r = -15 + 20r + -20r Combine like terms: 20r + -20r = 0 -39 + -12r = -15 + 0 -39 + -12r = -15 Add '39' to each side of the equation. -39 + 39 + -12r = -15 + 39 Combine like terms: -39 + 39 = 0 0 + -12r = -15 + 39 -12r = -15 + 39 Combine like terms: -15 + 39 = 24 -12r = 24 Divide each side by '-12'. r = -2 Simplifying r = -2
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