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Simplifying 39 + -7r = 3(6 + -4r) 39 + -7r = (6 * 3 + -4r * 3) 39 + -7r = (18 + -12r) Solving 39 + -7r = 18 + -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. 39 + -7r + 12r = 18 + -12r + 12r Combine like terms: -7r + 12r = 5r 39 + 5r = 18 + -12r + 12r Combine like terms: -12r + 12r = 0 39 + 5r = 18 + 0 39 + 5r = 18 Add '-39' to each side of the equation. 39 + -39 + 5r = 18 + -39 Combine like terms: 39 + -39 = 0 0 + 5r = 18 + -39 5r = 18 + -39 Combine like terms: 18 + -39 = -21 5r = -21 Divide each side by '5'. r = -4.2 Simplifying r = -4.2
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