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Simplifying 9r + -9 = 12r Reorder the terms: -9 + 9r = 12r Solving -9 + 9r = 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. -9 + 9r + -12r = 12r + -12r Combine like terms: 9r + -12r = -3r -9 + -3r = 12r + -12r Combine like terms: 12r + -12r = 0 -9 + -3r = 0 Add '9' to each side of the equation. -9 + 9 + -3r = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -3r = 0 + 9 -3r = 0 + 9 Combine like terms: 0 + 9 = 9 -3r = 9 Divide each side by '-3'. r = -3 Simplifying r = -3
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