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Simplifying -2r + -15 = 8r + -7r Reorder the terms: -15 + -2r = 8r + -7r Combine like terms: 8r + -7r = 1r -15 + -2r = 1r Solving -15 + -2r = 1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -15 + -2r + -1r = 1r + -1r Combine like terms: -2r + -1r = -3r -15 + -3r = 1r + -1r Combine like terms: 1r + -1r = 0 -15 + -3r = 0 Add '15' to each side of the equation. -15 + 15 + -3r = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -3r = 0 + 15 -3r = 0 + 15 Combine like terms: 0 + 15 = 15 -3r = 15 Divide each side by '-3'. r = -5 Simplifying r = -5
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