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Simplifying 7r + -12 = 9 + 4r Reorder the terms: -12 + 7r = 9 + 4r Solving -12 + 7r = 9 + 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. -12 + 7r + -4r = 9 + 4r + -4r Combine like terms: 7r + -4r = 3r -12 + 3r = 9 + 4r + -4r Combine like terms: 4r + -4r = 0 -12 + 3r = 9 + 0 -12 + 3r = 9 Add '12' to each side of the equation. -12 + 12 + 3r = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 3r = 9 + 12 3r = 9 + 12 Combine like terms: 9 + 12 = 21 3r = 21 Divide each side by '3'. r = 7 Simplifying r = 7
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