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Simplifying 3 + -2(2r + -4) = 0 Reorder the terms: 3 + -2(-4 + 2r) = 0 3 + (-4 * -2 + 2r * -2) = 0 3 + (8 + -4r) = 0 Combine like terms: 3 + 8 = 11 11 + -4r = 0 Solving 11 + -4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -4r = 0 + -11 Combine like terms: 11 + -11 = 0 0 + -4r = 0 + -11 -4r = 0 + -11 Combine like terms: 0 + -11 = -11 -4r = -11 Divide each side by '-4'. r = 2.75 Simplifying r = 2.75
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