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Simplifying 18 = 3 + -1(r + 4) Reorder the terms: 18 = 3 + -1(4 + r) 18 = 3 + (4 * -1 + r * -1) 18 = 3 + (-4 + -1r) Combine like terms: 3 + -4 = -1 18 = -1 + -1r Solving 18 = -1 + -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. 18 + r = -1 + -1r + r Combine like terms: -1r + r = 0 18 + r = -1 + 0 18 + r = -1 Add '-18' to each side of the equation. 18 + -18 + r = -1 + -18 Combine like terms: 18 + -18 = 0 0 + r = -1 + -18 r = -1 + -18 Combine like terms: -1 + -18 = -19 r = -19 Simplifying r = -19
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