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Simplifying -10r + -13 = -9r + 7 Reorder the terms: -13 + -10r = -9r + 7 Reorder the terms: -13 + -10r = 7 + -9r Solving -13 + -10r = 7 + -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. -13 + -10r + 9r = 7 + -9r + 9r Combine like terms: -10r + 9r = -1r -13 + -1r = 7 + -9r + 9r Combine like terms: -9r + 9r = 0 -13 + -1r = 7 + 0 -13 + -1r = 7 Add '13' to each side of the equation. -13 + 13 + -1r = 7 + 13 Combine like terms: -13 + 13 = 0 0 + -1r = 7 + 13 -1r = 7 + 13 Combine like terms: 7 + 13 = 20 -1r = 20 Divide each side by '-1'. r = -20 Simplifying r = -20
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