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Simplifying -42r + -1(-18r) + (-12) = 84 Remove parenthesis around (-18r) -42r + -1 * -18r + (-12) = 84 Multiply -1 * -18 -42r + 18r + (-12) = 84 -42r + 18r + -12 = 84 Reorder the terms: -12 + -42r + 18r = 84 Combine like terms: -42r + 18r = -24r -12 + -24r = 84 Solving -12 + -24r = 84 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -24r = 84 + 12 Combine like terms: -12 + 12 = 0 0 + -24r = 84 + 12 -24r = 84 + 12 Combine like terms: 84 + 12 = 96 -24r = 96 Divide each side by '-24'. r = -4 Simplifying r = -4
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