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Simplifying -4(r + 7) = 57 Reorder the terms: -4(7 + r) = 57 (7 * -4 + r * -4) = 57 (-28 + -4r) = 57 Solving -28 + -4r = 57 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 = 57 + 28 Combine like terms: -28 + 28 = 0 0 + -4r = 57 + 28 -4r = 57 + 28 Combine like terms: 57 + 28 = 85 -4r = 85 Divide each side by '-4'. r = -21.25 Simplifying r = -21.25
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