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Simplifying 80 = 8(7r + -4) Reorder the terms: 80 = 8(-4 + 7r) 80 = (-4 * 8 + 7r * 8) 80 = (-32 + 56r) Solving 80 = -32 + 56r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-56r' to each side of the equation. 80 + -56r = -32 + 56r + -56r Combine like terms: 56r + -56r = 0 80 + -56r = -32 + 0 80 + -56r = -32 Add '-80' to each side of the equation. 80 + -80 + -56r = -32 + -80 Combine like terms: 80 + -80 = 0 0 + -56r = -32 + -80 -56r = -32 + -80 Combine like terms: -32 + -80 = -112 -56r = -112 Divide each side by '-56'. r = 2 Simplifying r = 2
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