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Simplifying -72 = 8(-10 + r) -72 = (-10 * 8 + r * 8) -72 = (-80 + 8r) Solving -72 = -80 + 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. -72 + -8r = -80 + 8r + -8r Combine like terms: 8r + -8r = 0 -72 + -8r = -80 + 0 -72 + -8r = -80 Add '72' to each side of the equation. -72 + 72 + -8r = -80 + 72 Combine like terms: -72 + 72 = 0 0 + -8r = -80 + 72 -8r = -80 + 72 Combine like terms: -80 + 72 = -8 -8r = -8 Divide each side by '-8'. r = 1 Simplifying r = 1
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