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Simplifying -4(R + 7) = -42 Reorder the terms: -4(7 + R) = -42 (7 * -4 + R * -4) = -42 (-28 + -4R) = -42 Solving -28 + -4R = -42 Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -4R = -42 + 28 Combine like terms: -28 + 28 = 0 0 + -4R = -42 + 28 -4R = -42 + 28 Combine like terms: -42 + 28 = -14 -4R = -14 Divide each side by '-4'. R = 3.5 Simplifying R = 3.5
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