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Simplifying 7(r + -80) + -72 = 12 Reorder the terms: 7(-80 + r) + -72 = 12 (-80 * 7 + r * 7) + -72 = 12 (-560 + 7r) + -72 = 12 Reorder the terms: -560 + -72 + 7r = 12 Combine like terms: -560 + -72 = -632 -632 + 7r = 12 Solving -632 + 7r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '632' to each side of the equation. -632 + 632 + 7r = 12 + 632 Combine like terms: -632 + 632 = 0 0 + 7r = 12 + 632 7r = 12 + 632 Combine like terms: 12 + 632 = 644 7r = 644 Divide each side by '7'. r = 92 Simplifying r = 92
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