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Simplifying -80 = 8(r + -1) Reorder the terms: -80 = 8(-1 + r) -80 = (-1 * 8 + r * 8) -80 = (-8 + 8r) Solving -80 = -8 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. -80 + -8r = -8 + 8r + -8r Combine like terms: 8r + -8r = 0 -80 + -8r = -8 + 0 -80 + -8r = -8 Add '80' to each side of the equation. -80 + 80 + -8r = -8 + 80 Combine like terms: -80 + 80 = 0 0 + -8r = -8 + 80 -8r = -8 + 80 Combine like terms: -8 + 80 = 72 -8r = 72 Divide each side by '-8'. r = -9 Simplifying r = -9
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