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Simplifying 3(3 + x) = 15 + -4x (3 * 3 + x * 3) = 15 + -4x (9 + 3x) = 15 + -4x Solving 9 + 3x = 15 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 9 + 3x + 4x = 15 + -4x + 4x Combine like terms: 3x + 4x = 7x 9 + 7x = 15 + -4x + 4x Combine like terms: -4x + 4x = 0 9 + 7x = 15 + 0 9 + 7x = 15 Add '-9' to each side of the equation. 9 + -9 + 7x = 15 + -9 Combine like terms: 9 + -9 = 0 0 + 7x = 15 + -9 7x = 15 + -9 Combine like terms: 15 + -9 = 6 7x = 6 Divide each side by '7'. x = 0.8571428571 Simplifying x = 0.8571428571
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