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Simplifying 7(r + -9) = 147 Reorder the terms: 7(-9 + r) = 147 (-9 * 7 + r * 7) = 147 (-63 + 7r) = 147 Solving -63 + 7r = 147 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 7r = 147 + 63 Combine like terms: -63 + 63 = 0 0 + 7r = 147 + 63 7r = 147 + 63 Combine like terms: 147 + 63 = 210 7r = 210 Divide each side by '7'. r = 30 Simplifying r = 30
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