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Simplifying 7r + -12 = -30 + 9r Reorder the terms: -12 + 7r = -30 + 9r Solving -12 + 7r = -30 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. -12 + 7r + -9r = -30 + 9r + -9r Combine like terms: 7r + -9r = -2r -12 + -2r = -30 + 9r + -9r Combine like terms: 9r + -9r = 0 -12 + -2r = -30 + 0 -12 + -2r = -30 Add '12' to each side of the equation. -12 + 12 + -2r = -30 + 12 Combine like terms: -12 + 12 = 0 0 + -2r = -30 + 12 -2r = -30 + 12 Combine like terms: -30 + 12 = -18 -2r = -18 Divide each side by '-2'. r = 9 Simplifying r = 9
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