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Simplifying 2x + 4 + -7x = -21 Reorder the terms: 4 + 2x + -7x = -21 Combine like terms: 2x + -7x = -5x 4 + -5x = -21 Solving 4 + -5x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5x = -21 + -4 Combine like terms: 4 + -4 = 0 0 + -5x = -21 + -4 -5x = -21 + -4 Combine like terms: -21 + -4 = -25 -5x = -25 Divide each side by '-5'. x = 5 Simplifying x = 5
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