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Simplifying 3x + -9 + 4x + 2 = 42 Reorder the terms: -9 + 2 + 3x + 4x = 42 Combine like terms: -9 + 2 = -7 -7 + 3x + 4x = 42 Combine like terms: 3x + 4x = 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 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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