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Simplifying -66 = -2(1 + 5r) + -4 -66 = (1 * -2 + 5r * -2) + -4 -66 = (-2 + -10r) + -4 Reorder the terms: -66 = -2 + -4 + -10r Combine like terms: -2 + -4 = -6 -66 = -6 + -10r Solving -66 = -6 + -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 = -6 + -10r + 10r Combine like terms: -10r + 10r = 0 -66 + 10r = -6 + 0 -66 + 10r = -6 Add '66' to each side of the equation. -66 + 66 + 10r = -6 + 66 Combine like terms: -66 + 66 = 0 0 + 10r = -6 + 66 10r = -6 + 66 Combine like terms: -6 + 66 = 60 10r = 60 Divide each side by '10'. r = 6 Simplifying r = 6
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