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