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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 = 6 -3r = 6 Divide each side by '-3'. r = -2 Simplifying r = -2
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