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Simplifying r + 3 = 15 + 2r Reorder the terms: 3 + r = 15 + 2r Solving 3 + r = 15 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 3 + r + -2r = 15 + 2r + -2r Combine like terms: r + -2r = -1r 3 + -1r = 15 + 2r + -2r Combine like terms: 2r + -2r = 0 3 + -1r = 15 + 0 3 + -1r = 15 Add '-3' to each side of the equation. 3 + -3 + -1r = 15 + -3 Combine like terms: 3 + -3 = 0 0 + -1r = 15 + -3 -1r = 15 + -3 Combine like terms: 15 + -3 = 12 -1r = 12 Divide each side by '-1'. r = -12 Simplifying r = -12
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