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Simplifying -3(r + -4) + 4r = 0 Reorder the terms: -3(-4 + r) + 4r = 0 (-4 * -3 + r * -3) + 4r = 0 (12 + -3r) + 4r = 0 Combine like terms: -3r + 4r = 1r 12 + 1r = 0 Solving 12 + 1r = 0 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 + 1r = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 1r = 0 + -12 1r = 0 + -12 Combine like terms: 0 + -12 = -12 1r = -12 Divide each side by '1'. r = -12 Simplifying r = -12
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