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Simplifying 7x + -4x + 21 = 15 Reorder the terms: 21 + 7x + -4x = 15 Combine like terms: 7x + -4x = 3x 21 + 3x = 15 Solving 21 + 3x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 15 + -21 3x = 15 + -21 Combine like terms: 15 + -21 = -6 3x = -6 Divide each side by '3'. x = -2 Simplifying x = -2
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