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Simplifying 10r + -5(-7 + -1r) = 0 10r + (-7 * -5 + -1r * -5) = 0 10r + (35 + 5r) = 0 Reorder the terms: 35 + 10r + 5r = 0 Combine like terms: 10r + 5r = 15r 35 + 15r = 0 Solving 35 + 15r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + 15r = 0 + -35 Combine like terms: 35 + -35 = 0 0 + 15r = 0 + -35 15r = 0 + -35 Combine like terms: 0 + -35 = -35 15r = -35 Divide each side by '15'. r = -2.333333333 Simplifying r = -2.333333333
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