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Simplifying 2(6r + -9) + -13r = 18 Reorder the terms: 2(-9 + 6r) + -13r = 18 (-9 * 2 + 6r * 2) + -13r = 18 (-18 + 12r) + -13r = 18 Combine like terms: 12r + -13r = -1r -18 + -1r = 18 Solving -18 + -1r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -1r = 18 + 18 Combine like terms: -18 + 18 = 0 0 + -1r = 18 + 18 -1r = 18 + 18 Combine like terms: 18 + 18 = 36 -1r = 36 Divide each side by '-1'. r = -36 Simplifying r = -36
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