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Simplifying 3x + 7 = 15 + -4x Reorder the terms: 7 + 3x = 15 + -4x Solving 7 + 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. 7 + 3x + 4x = 15 + -4x + 4x Combine like terms: 3x + 4x = 7x 7 + 7x = 15 + -4x + 4x Combine like terms: -4x + 4x = 0 7 + 7x = 15 + 0 7 + 7x = 15 Add '-7' to each side of the equation. 7 + -7 + 7x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 15 + -7 7x = 15 + -7 Combine like terms: 15 + -7 = 8 7x = 8 Divide each side by '7'. x = 1.142857143 Simplifying x = 1.142857143
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