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Simplifying 3r + 7 = 15 + r Reorder the terms: 7 + 3r = 15 + r Solving 7 + 3r = 15 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 7 + 3r + -1r = 15 + r + -1r Combine like terms: 3r + -1r = 2r 7 + 2r = 15 + r + -1r Combine like terms: r + -1r = 0 7 + 2r = 15 + 0 7 + 2r = 15 Add '-7' to each side of the equation. 7 + -7 + 2r = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 2r = 15 + -7 2r = 15 + -7 Combine like terms: 15 + -7 = 8 2r = 8 Divide each side by '2'. r = 4 Simplifying r = 4
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