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Simplifying 9(-5 + -4) = -10 + -2r Combine like terms: -5 + -4 = -9 9(-9) = -10 + -2r Multiply 9 * -9 -81 = -10 + -2r Solving -81 = -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. -81 + 2r = -10 + -2r + 2r Combine like terms: -2r + 2r = 0 -81 + 2r = -10 + 0 -81 + 2r = -10 Add '81' to each side of the equation. -81 + 81 + 2r = -10 + 81 Combine like terms: -81 + 81 = 0 0 + 2r = -10 + 81 2r = -10 + 81 Combine like terms: -10 + 81 = 71 2r = 71 Divide each side by '2'. r = 35.5 Simplifying r = 35.5
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