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Simplifying 2(r) + -7 = r + 15 Reorder the terms: -7 + 2r = r + 15 Reorder the terms: -7 + 2r = 15 + r Solving -7 + 2r = 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 + 2r + -1r = 15 + r + -1r Combine like terms: 2r + -1r = 1r -7 + 1r = 15 + r + -1r Combine like terms: r + -1r = 0 -7 + 1r = 15 + 0 -7 + 1r = 15 Add '7' to each side of the equation. -7 + 7 + 1r = 15 + 7 Combine like terms: -7 + 7 = 0 0 + 1r = 15 + 7 1r = 15 + 7 Combine like terms: 15 + 7 = 22 1r = 22 Divide each side by '1'. r = 22 Simplifying r = 22
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