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Simplifying 8r + -20 = 12r + 20 Reorder the terms: -20 + 8r = 12r + 20 Reorder the terms: -20 + 8r = 20 + 12r Solving -20 + 8r = 20 + 12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12r' to each side of the equation. -20 + 8r + -12r = 20 + 12r + -12r Combine like terms: 8r + -12r = -4r -20 + -4r = 20 + 12r + -12r Combine like terms: 12r + -12r = 0 -20 + -4r = 20 + 0 -20 + -4r = 20 Add '20' to each side of the equation. -20 + 20 + -4r = 20 + 20 Combine like terms: -20 + 20 = 0 0 + -4r = 20 + 20 -4r = 20 + 20 Combine like terms: 20 + 20 = 40 -4r = 40 Divide each side by '-4'. r = -10 Simplifying r = -10
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