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Simplifying 18(r + -2) = 4(r + -9) Reorder the terms: 18(-2 + r) = 4(r + -9) (-2 * 18 + r * 18) = 4(r + -9) (-36 + 18r) = 4(r + -9) Reorder the terms: -36 + 18r = 4(-9 + r) -36 + 18r = (-9 * 4 + r * 4) -36 + 18r = (-36 + 4r) Add '36' to each side of the equation. -36 + 36 + 18r = -36 + 36 + 4r Combine like terms: -36 + 36 = 0 0 + 18r = -36 + 36 + 4r 18r = -36 + 36 + 4r Combine like terms: -36 + 36 = 0 18r = 0 + 4r 18r = 4r Solving 18r = 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. 18r + -4r = 4r + -4r Combine like terms: 18r + -4r = 14r 14r = 4r + -4r Combine like terms: 4r + -4r = 0 14r = 0 Divide each side by '14'. r = 0 Simplifying r = 0
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