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Simplifying 15(r + 2) = 12r + -1 Reorder the terms: 15(2 + r) = 12r + -1 (2 * 15 + r * 15) = 12r + -1 (30 + 15r) = 12r + -1 Reorder the terms: 30 + 15r = -1 + 12r Solving 30 + 15r = -1 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. 30 + 15r + -12r = -1 + 12r + -12r Combine like terms: 15r + -12r = 3r 30 + 3r = -1 + 12r + -12r Combine like terms: 12r + -12r = 0 30 + 3r = -1 + 0 30 + 3r = -1 Add '-30' to each side of the equation. 30 + -30 + 3r = -1 + -30 Combine like terms: 30 + -30 = 0 0 + 3r = -1 + -30 3r = -1 + -30 Combine like terms: -1 + -30 = -31 3r = -31 Divide each side by '3'. r = -10.33333333 Simplifying r = -10.33333333
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