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Simplifying -7r + -8 + -5r = -13 + -7r Reorder the terms: -8 + -7r + -5r = -13 + -7r Combine like terms: -7r + -5r = -12r -8 + -12r = -13 + -7r Solving -8 + -12r = -13 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -8 + -12r + 7r = -13 + -7r + 7r Combine like terms: -12r + 7r = -5r -8 + -5r = -13 + -7r + 7r Combine like terms: -7r + 7r = 0 -8 + -5r = -13 + 0 -8 + -5r = -13 Add '8' to each side of the equation. -8 + 8 + -5r = -13 + 8 Combine like terms: -8 + 8 = 0 0 + -5r = -13 + 8 -5r = -13 + 8 Combine like terms: -13 + 8 = -5 -5r = -5 Divide each side by '-5'. r = 1 Simplifying r = 1
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