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Simplifying 12 = 2r + 4r Combine like terms: 2r + 4r = 6r 12 = 6r Solving 12 = 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 12 + -6r = 6r + -6r Combine like terms: 6r + -6r = 0 12 + -6r = 0 Add '-12' to each side of the equation. 12 + -12 + -6r = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -6r = 0 + -12 -6r = 0 + -12 Combine like terms: 0 + -12 = -12 -6r = -12 Divide each side by '-6'. r = 2 Simplifying r = 2
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