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Simplifying 7(12 + -1r) = 84 (12 * 7 + -1r * 7) = 84 (84 + -7r) = 84 Add '-84' to each side of the equation. 84 + -84 + -7r = 84 + -84 Combine like terms: 84 + -84 = 0 0 + -7r = 84 + -84 -7r = 84 + -84 Combine like terms: 84 + -84 = 0 -7r = 0 Solving -7r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-7'. r = 0 Simplifying r = 0
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