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Simplifying 3x + 4x + -2 = 21 Reorder the terms: -2 + 3x + 4x = 21 Combine like terms: 3x + 4x = 7x -2 + 7x = 21 Solving -2 + 7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 7x = 21 + 2 Combine like terms: -2 + 2 = 0 0 + 7x = 21 + 2 7x = 21 + 2 Combine like terms: 21 + 2 = 23 7x = 23 Divide each side by '7'. x = 3.285714286 Simplifying x = 3.285714286
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