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Simplifying 12 = 2(3r + -4) + -4 Reorder the terms: 12 = 2(-4 + 3r) + -4 12 = (-4 * 2 + 3r * 2) + -4 12 = (-8 + 6r) + -4 Reorder the terms: 12 = -8 + -4 + 6r Combine like terms: -8 + -4 = -12 12 = -12 + 6r Solving 12 = -12 + 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 12 + -6r = -12 + 6r + -6r Combine like terms: 6r + -6r = 0 12 + -6r = -12 + 0 12 + -6r = -12 Add '-12' to each side of the equation. 12 + -12 + -6r = -12 + -12 Combine like terms: 12 + -12 = 0 0 + -6r = -12 + -12 -6r = -12 + -12 Combine like terms: -12 + -12 = -24 -6r = -24 Divide each side by '-6'. r = 4 Simplifying r = 4
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