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Simplifying 39 + -8r = -3(1 + 3r) + -5r 39 + -8r = (1 * -3 + 3r * -3) + -5r 39 + -8r = (-3 + -9r) + -5r Combine like terms: -9r + -5r = -14r 39 + -8r = -3 + -14r Solving 39 + -8r = -3 + -14r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '14r' to each side of the equation. 39 + -8r + 14r = -3 + -14r + 14r Combine like terms: -8r + 14r = 6r 39 + 6r = -3 + -14r + 14r Combine like terms: -14r + 14r = 0 39 + 6r = -3 + 0 39 + 6r = -3 Add '-39' to each side of the equation. 39 + -39 + 6r = -3 + -39 Combine like terms: 39 + -39 = 0 0 + 6r = -3 + -39 6r = -3 + -39 Combine like terms: -3 + -39 = -42 6r = -42 Divide each side by '6'. r = -7 Simplifying r = -7
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