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Simplifying 15 + -5r + -8 = -8 + -2r Reorder the terms: 15 + -8 + -5r = -8 + -2r Combine like terms: 15 + -8 = 7 7 + -5r = -8 + -2r Solving 7 + -5r = -8 + -2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2r' to each side of the equation. 7 + -5r + 2r = -8 + -2r + 2r Combine like terms: -5r + 2r = -3r 7 + -3r = -8 + -2r + 2r Combine like terms: -2r + 2r = 0 7 + -3r = -8 + 0 7 + -3r = -8 Add '-7' to each side of the equation. 7 + -7 + -3r = -8 + -7 Combine like terms: 7 + -7 = 0 0 + -3r = -8 + -7 -3r = -8 + -7 Combine like terms: -8 + -7 = -15 -3r = -15 Divide each side by '-3'. r = 5 Simplifying r = 5
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