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Simplifying 30 = 4r + -42 Reorder the terms: 30 = -42 + 4r Solving 30 = -42 + 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. 30 + -4r = -42 + 4r + -4r Combine like terms: 4r + -4r = 0 30 + -4r = -42 + 0 30 + -4r = -42 Add '-30' to each side of the equation. 30 + -30 + -4r = -42 + -30 Combine like terms: 30 + -30 = 0 0 + -4r = -42 + -30 -4r = -42 + -30 Combine like terms: -42 + -30 = -72 -4r = -72 Divide each side by '-4'. r = 18 Simplifying r = 18
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