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Simplifying -42 = 4r + -18 Reorder the terms: -42 = -18 + 4r Solving -42 = -18 + 4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4r' to each side of the equation. -42 + -4r = -18 + 4r + -4r Combine like terms: 4r + -4r = 0 -42 + -4r = -18 + 0 -42 + -4r = -18 Add '42' to each side of the equation. -42 + 42 + -4r = -18 + 42 Combine like terms: -42 + 42 = 0 0 + -4r = -18 + 42 -4r = -18 + 42 Combine like terms: -18 + 42 = 24 -4r = 24 Divide each side by '-4'. r = -6 Simplifying r = -6
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