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Simplifying -7 + -1r = 2r + 8 Reorder the terms: -7 + -1r = 8 + 2r Solving -7 + -1r = 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 + -1r + -2r = 8 + 2r + -2r Combine like terms: -1r + -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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