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