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Simplifying 4x + 2 + 3x + -9 = 21 Reorder the terms: 2 + -9 + 4x + 3x = 21 Combine like terms: 2 + -9 = -7 -7 + 4x + 3x = 21 Combine like terms: 4x + 3x = 7x -7 + 7x = 21 Solving -7 + 7x = 21 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 = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7x = 21 + 7 7x = 21 + 7 Combine like terms: 21 + 7 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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