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Simplifying -7 + -2r = 4 + 9r Solving -7 + -2r = 4 + 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. -7 + -2r + -9r = 4 + 9r + -9r Combine like terms: -2r + -9r = -11r -7 + -11r = 4 + 9r + -9r Combine like terms: 9r + -9r = 0 -7 + -11r = 4 + 0 -7 + -11r = 4 Add '7' to each side of the equation. -7 + 7 + -11r = 4 + 7 Combine like terms: -7 + 7 = 0 0 + -11r = 4 + 7 -11r = 4 + 7 Combine like terms: 4 + 7 = 11 -11r = 11 Divide each side by '-11'. r = -1 Simplifying r = -1
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