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Simplifying -5(1 + 3r) = 70 (1 * -5 + 3r * -5) = 70 (-5 + -15r) = 70 Solving -5 + -15r = 70 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -15r = 70 + 5 Combine like terms: -5 + 5 = 0 0 + -15r = 70 + 5 -15r = 70 + 5 Combine like terms: 70 + 5 = 75 -15r = 75 Divide each side by '-15'. r = -5 Simplifying r = -5
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