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