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Simplifying -3(r + -4) + 4 = -15 Reorder the terms: -3(-4 + r) + 4 = -15 (-4 * -3 + r * -3) + 4 = -15 (12 + -3r) + 4 = -15 Reorder the terms: 12 + 4 + -3r = -15 Combine like terms: 12 + 4 = 16 16 + -3r = -15 Solving 16 + -3r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + -3r = -15 + -16 Combine like terms: 16 + -16 = 0 0 + -3r = -15 + -16 -3r = -15 + -16 Combine like terms: -15 + -16 = -31 -3r = -31 Divide each side by '-3'. r = 10.33333333 Simplifying r = 10.33333333
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