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Simplifying 112 = -4(7 + -5r) 112 = (7 * -4 + -5r * -4) 112 = (-28 + 20r) Solving 112 = -28 + 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. 112 + -20r = -28 + 20r + -20r Combine like terms: 20r + -20r = 0 112 + -20r = -28 + 0 112 + -20r = -28 Add '-112' to each side of the equation. 112 + -112 + -20r = -28 + -112 Combine like terms: 112 + -112 = 0 0 + -20r = -28 + -112 -20r = -28 + -112 Combine like terms: -28 + -112 = -140 -20r = -140 Divide each side by '-20'. r = 7 Simplifying r = 7
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