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Simplifying -12r + 3 + r = -7 + -1(12) Reorder the terms: 3 + -12r + r = -7 + -1(12) Combine like terms: -12r + r = -11r 3 + -11r = -7 + -1(12) Multiply -1 * 12 3 + -11r = -7 + -12 Combine like terms: -7 + -12 = -19 3 + -11r = -19 Solving 3 + -11r = -19 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -11r = -19 + -3 Combine like terms: 3 + -3 = 0 0 + -11r = -19 + -3 -11r = -19 + -3 Combine like terms: -19 + -3 = -22 -11r = -22 Divide each side by '-11'. r = 2 Simplifying r = 2
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