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Simplifying -3(1 + -7r) = -150 (1 * -3 + -7r * -3) = -150 (-3 + 21r) = -150 Solving -3 + 21r = -150 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 21r = -150 + 3 Combine like terms: -3 + 3 = 0 0 + 21r = -150 + 3 21r = -150 + 3 Combine like terms: -150 + 3 = -147 21r = -147 Divide each side by '21'. r = -7 Simplifying r = -7
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