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Simplifying 2(2r + -5) + -18 = 0 Reorder the terms: 2(-5 + 2r) + -18 = 0 (-5 * 2 + 2r * 2) + -18 = 0 (-10 + 4r) + -18 = 0 Reorder the terms: -10 + -18 + 4r = 0 Combine like terms: -10 + -18 = -28 -28 + 4r = 0 Solving -28 + 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 4r = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 4r = 0 + 28 4r = 0 + 28 Combine like terms: 0 + 28 = 28 4r = 28 Divide each side by '4'. r = 7 Simplifying r = 7
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