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Simplifying 66 = 6 + -2(5r + -5) Reorder the terms: 66 = 6 + -2(-5 + 5r) 66 = 6 + (-5 * -2 + 5r * -2) 66 = 6 + (10 + -10r) Combine like terms: 6 + 10 = 16 66 = 16 + -10r Solving 66 = 16 + -10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10r' to each side of the equation. 66 + 10r = 16 + -10r + 10r Combine like terms: -10r + 10r = 0 66 + 10r = 16 + 0 66 + 10r = 16 Add '-66' to each side of the equation. 66 + -66 + 10r = 16 + -66 Combine like terms: 66 + -66 = 0 0 + 10r = 16 + -66 10r = 16 + -66 Combine like terms: 16 + -66 = -50 10r = -50 Divide each side by '10'. r = -5 Simplifying r = -5
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