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Simplifying -36 = -3(3r + 1) + -2r Reorder the terms: -36 = -3(1 + 3r) + -2r -36 = (1 * -3 + 3r * -3) + -2r -36 = (-3 + -9r) + -2r Combine like terms: -9r + -2r = -11r -36 = -3 + -11r Solving -36 = -3 + -11r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '11r' to each side of the equation. -36 + 11r = -3 + -11r + 11r Combine like terms: -11r + 11r = 0 -36 + 11r = -3 + 0 -36 + 11r = -3 Add '36' to each side of the equation. -36 + 36 + 11r = -3 + 36 Combine like terms: -36 + 36 = 0 0 + 11r = -3 + 36 11r = -3 + 36 Combine like terms: -3 + 36 = 33 11r = 33 Divide each side by '11'. r = 3 Simplifying r = 3
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