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Simplifying 12r + -3 = 4r + 9 Reorder the terms: -3 + 12r = 4r + 9 Reorder the terms: -3 + 12r = 9 + 4r Solving -3 + 12r = 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. -3 + 12r + -4r = 9 + 4r + -4r Combine like terms: 12r + -4r = 8r -3 + 8r = 9 + 4r + -4r Combine like terms: 4r + -4r = 0 -3 + 8r = 9 + 0 -3 + 8r = 9 Add '3' to each side of the equation. -3 + 3 + 8r = 9 + 3 Combine like terms: -3 + 3 = 0 0 + 8r = 9 + 3 8r = 9 + 3 Combine like terms: 9 + 3 = 12 8r = 12 Divide each side by '8'. r = 1.5 Simplifying r = 1.5
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