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Simplifying -18 = 7r + -2 + 9r Reorder the terms: -18 = -2 + 7r + 9r Combine like terms: 7r + 9r = 16r -18 = -2 + 16r Solving -18 = -2 + 16r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-16r' to each side of the equation. -18 + -16r = -2 + 16r + -16r Combine like terms: 16r + -16r = 0 -18 + -16r = -2 + 0 -18 + -16r = -2 Add '18' to each side of the equation. -18 + 18 + -16r = -2 + 18 Combine like terms: -18 + 18 = 0 0 + -16r = -2 + 18 -16r = -2 + 18 Combine like terms: -2 + 18 = 16 -16r = 16 Divide each side by '-16'. r = -1 Simplifying r = -1
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