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Simplifying 215 + r = 165 + 2r Solving 215 + r = 165 + 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. 215 + r + -2r = 165 + 2r + -2r Combine like terms: r + -2r = -1r 215 + -1r = 165 + 2r + -2r Combine like terms: 2r + -2r = 0 215 + -1r = 165 + 0 215 + -1r = 165 Add '-215' to each side of the equation. 215 + -215 + -1r = 165 + -215 Combine like terms: 215 + -215 = 0 0 + -1r = 165 + -215 -1r = 165 + -215 Combine like terms: 165 + -215 = -50 -1r = -50 Divide each side by '-1'. r = 50 Simplifying r = 50
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