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Simplifying 3x + 4x + -42 = 42 Reorder the terms: -42 + 3x + 4x = 42 Combine like terms: 3x + 4x = 7x -42 + 7x = 42 Solving -42 + 7x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 7x = 42 + 42 Combine like terms: -42 + 42 = 0 0 + 7x = 42 + 42 7x = 42 + 42 Combine like terms: 42 + 42 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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