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Simplifying 7 + 20x + 4(12x) = 439 + 20x Remove parenthesis around (12x) 7 + 20x + 4 * 12x = 439 + 20x Multiply 4 * 12 7 + 20x + 48x = 439 + 20x Combine like terms: 20x + 48x = 68x 7 + 68x = 439 + 20x Solving 7 + 68x = 439 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 7 + 68x + -20x = 439 + 20x + -20x Combine like terms: 68x + -20x = 48x 7 + 48x = 439 + 20x + -20x Combine like terms: 20x + -20x = 0 7 + 48x = 439 + 0 7 + 48x = 439 Add '-7' to each side of the equation. 7 + -7 + 48x = 439 + -7 Combine like terms: 7 + -7 = 0 0 + 48x = 439 + -7 48x = 439 + -7 Combine like terms: 439 + -7 = 432 48x = 432 Divide each side by '48'. x = 9 Simplifying x = 9
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