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Simplifying -7(1 + r) = 49 (1 * -7 + r * -7) = 49 (-7 + -7r) = 49 Solving -7 + -7r = 49 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -7r = 49 + 7 Combine like terms: -7 + 7 = 0 0 + -7r = 49 + 7 -7r = 49 + 7 Combine like terms: 49 + 7 = 56 -7r = 56 Divide each side by '-7'. r = -8 Simplifying r = -8
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