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Simplifying 805 = 7(-10r + -5) Reorder the terms: 805 = 7(-5 + -10r) 805 = (-5 * 7 + -10r * 7) 805 = (-35 + -70r) Solving 805 = -35 + -70r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '70r' to each side of the equation. 805 + 70r = -35 + -70r + 70r Combine like terms: -70r + 70r = 0 805 + 70r = -35 + 0 805 + 70r = -35 Add '-805' to each side of the equation. 805 + -805 + 70r = -35 + -805 Combine like terms: 805 + -805 = 0 0 + 70r = -35 + -805 70r = -35 + -805 Combine like terms: -35 + -805 = -840 70r = -840 Divide each side by '70'. r = -12 Simplifying r = -12
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