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Simplifying 12 + -2r = 20 Solving 12 + -2r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -2r = 20 + -12 Combine like terms: 12 + -12 = 0 0 + -2r = 20 + -12 -2r = 20 + -12 Combine like terms: 20 + -12 = 8 -2r = 8 Divide each side by '-2'. r = -4 Simplifying r = -4
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