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Simplifying 2r + -2(5r + -6) = 18 Reorder the terms: 2r + -2(-6 + 5r) = 18 2r + (-6 * -2 + 5r * -2) = 18 2r + (12 + -10r) = 18 Reorder the terms: 12 + 2r + -10r = 18 Combine like terms: 2r + -10r = -8r 12 + -8r = 18 Solving 12 + -8r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -8r = 18 + -12 Combine like terms: 12 + -12 = 0 0 + -8r = 18 + -12 -8r = 18 + -12 Combine like terms: 18 + -12 = 6 -8r = 6 Divide each side by '-8'. r = -0.75 Simplifying r = -0.75
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