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Simplifying -9r + -4 = 10r + 15 Reorder the terms: -4 + -9r = 10r + 15 Reorder the terms: -4 + -9r = 15 + 10r Solving -4 + -9r = 15 + 10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10r' to each side of the equation. -4 + -9r + -10r = 15 + 10r + -10r Combine like terms: -9r + -10r = -19r -4 + -19r = 15 + 10r + -10r Combine like terms: 10r + -10r = 0 -4 + -19r = 15 + 0 -4 + -19r = 15 Add '4' to each side of the equation. -4 + 4 + -19r = 15 + 4 Combine like terms: -4 + 4 = 0 0 + -19r = 15 + 4 -19r = 15 + 4 Combine like terms: 15 + 4 = 19 -19r = 19 Divide each side by '-19'. r = -1 Simplifying r = -1
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