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Simplifying -7(r + 8) = -4 Reorder the terms: -7(8 + r) = -4 (8 * -7 + r * -7) = -4 (-56 + -7r) = -4 Solving -56 + -7r = -4 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + -7r = -4 + 56 Combine like terms: -56 + 56 = 0 0 + -7r = -4 + 56 -7r = -4 + 56 Combine like terms: -4 + 56 = 52 -7r = 52 Divide each side by '-7'. r = -7.428571429 Simplifying r = -7.428571429
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