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Simplifying 3x + -5x + 21 = 6 Reorder the terms: 21 + 3x + -5x = 6 Combine like terms: 3x + -5x = -2x 21 + -2x = 6 Solving 21 + -2x = 6 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 + -2x = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 6 + -21 -2x = 6 + -21 Combine like terms: 6 + -21 = -15 -2x = -15 Divide each side by '-2'. x = 7.5 Simplifying x = 7.5
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