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Simplifying -39 + -8r = 4(3 + -7r + 7r) + 3r Combine like terms: -7r + 7r = 0 -39 + -8r = 4(3 + 0) + 3r -39 + -8r = 4(3) + 3r Multiply 4 * 3 -39 + -8r = 12 + 3r Solving -39 + -8r = 12 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -39 + -8r + -3r = 12 + 3r + -3r Combine like terms: -8r + -3r = -11r -39 + -11r = 12 + 3r + -3r Combine like terms: 3r + -3r = 0 -39 + -11r = 12 + 0 -39 + -11r = 12 Add '39' to each side of the equation. -39 + 39 + -11r = 12 + 39 Combine like terms: -39 + 39 = 0 0 + -11r = 12 + 39 -11r = 12 + 39 Combine like terms: 12 + 39 = 51 -11r = 51 Divide each side by '-11'. r = -4.636363636 Simplifying r = -4.636363636
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