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Simplifying 3x + -7 + 4x = -21 Reorder the terms: -7 + 3x + 4x = -21 Combine like terms: 3x + 4x = 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 = -14 7x = -14 Divide each side by '7'. x = -2 Simplifying x = -2
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