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Simplifying 12 = 4(2r + -1) Reorder the terms: 12 = 4(-1 + 2r) 12 = (-1 * 4 + 2r * 4) 12 = (-4 + 8r) Solving 12 = -4 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 12 + -8r = -4 + 8r + -8r Combine like terms: 8r + -8r = 0 12 + -8r = -4 + 0 12 + -8r = -4 Add '-12' to each side of the equation. 12 + -12 + -8r = -4 + -12 Combine like terms: 12 + -12 = 0 0 + -8r = -4 + -12 -8r = -4 + -12 Combine like terms: -4 + -12 = -16 -8r = -16 Divide each side by '-8'. r = 2 Simplifying r = 2
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