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Simplifying 18 = -3(r + 4) Reorder the terms: 18 = -3(4 + r) 18 = (4 * -3 + r * -3) 18 = (-12 + -3r) Solving 18 = -12 + -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 18 + 3r = -12 + -3r + 3r Combine like terms: -3r + 3r = 0 18 + 3r = -12 + 0 18 + 3r = -12 Add '-18' to each side of the equation. 18 + -18 + 3r = -12 + -18 Combine like terms: 18 + -18 = 0 0 + 3r = -12 + -18 3r = -12 + -18 Combine like terms: -12 + -18 = -30 3r = -30 Divide each side by '3'. r = -10 Simplifying r = -10
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