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Simplifying 3(5 + -1r) + -1(15 + -1r) = 17 (5 * 3 + -1r * 3) + -1(15 + -1r) = 17 (15 + -3r) + -1(15 + -1r) = 17 15 + -3r + (15 * -1 + -1r * -1) = 17 15 + -3r + (-15 + 1r) = 17 Reorder the terms: 15 + -15 + -3r + 1r = 17 Combine like terms: 15 + -15 = 0 0 + -3r + 1r = 17 -3r + 1r = 17 Combine like terms: -3r + 1r = -2r -2r = 17 Solving -2r = 17 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-2'. r = -8.5 Simplifying r = -8.5
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