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Simplifying 56 = -8(7 + r) 56 = (7 * -8 + r * -8) 56 = (-56 + -8r) Solving 56 = -56 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. 56 + 8r = -56 + -8r + 8r Combine like terms: -8r + 8r = 0 56 + 8r = -56 + 0 56 + 8r = -56 Add '-56' to each side of the equation. 56 + -56 + 8r = -56 + -56 Combine like terms: 56 + -56 = 0 0 + 8r = -56 + -56 8r = -56 + -56 Combine like terms: -56 + -56 = -112 8r = -112 Divide each side by '8'. r = -14 Simplifying r = -14
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