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Simplifying 4(r + 3) = r Reorder the terms: 4(3 + r) = r (3 * 4 + r * 4) = r (12 + 4r) = r Solving 12 + 4r = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 12 + 4r + -1r = r + -1r Combine like terms: 4r + -1r = 3r 12 + 3r = r + -1r Combine like terms: r + -1r = 0 12 + 3r = 0 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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