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Simplifying 4x + -8 + 3x + 15 = 42 Reorder the terms: -8 + 15 + 4x + 3x = 42 Combine like terms: -8 + 15 = 7 7 + 4x + 3x = 42 Combine like terms: 4x + 3x = 7x 7 + 7x = 42 Solving 7 + 7x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 7x = 42 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 42 + -7 7x = 42 + -7 Combine like terms: 42 + -7 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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