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Simplifying -3 + r = 15 + -1r Solving -3 + r = 15 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -3 + r + r = 15 + -1r + r Combine like terms: r + r = 2r -3 + 2r = 15 + -1r + r Combine like terms: -1r + r = 0 -3 + 2r = 15 + 0 -3 + 2r = 15 Add '3' to each side of the equation. -3 + 3 + 2r = 15 + 3 Combine like terms: -3 + 3 = 0 0 + 2r = 15 + 3 2r = 15 + 3 Combine like terms: 15 + 3 = 18 2r = 18 Divide each side by '2'. r = 9 Simplifying r = 9
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