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Simplifying -13 = -7 + -3 + 2r Combine like terms: -7 + -3 = -10 -13 = -10 + 2r Solving -13 = -10 + 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. -13 + -2r = -10 + 2r + -2r Combine like terms: 2r + -2r = 0 -13 + -2r = -10 + 0 -13 + -2r = -10 Add '13' to each side of the equation. -13 + 13 + -2r = -10 + 13 Combine like terms: -13 + 13 = 0 0 + -2r = -10 + 13 -2r = -10 + 13 Combine like terms: -10 + 13 = 3 -2r = 3 Divide each side by '-2'. r = -1.5 Simplifying r = -1.5
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