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Simplifying 7 = -1(-2 + r) 7 = (-2 * -1 + r * -1) 7 = (2 + -1r) Solving 7 = 2 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. 7 + r = 2 + -1r + r Combine like terms: -1r + r = 0 7 + r = 2 + 0 7 + r = 2 Add '-7' to each side of the equation. 7 + -7 + r = 2 + -7 Combine like terms: 7 + -7 = 0 0 + r = 2 + -7 r = 2 + -7 Combine like terms: 2 + -7 = -5 r = -5 Simplifying r = -5
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