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Simplifying 10x + 21 = 15 + -2x Reorder the terms: 21 + 10x = 15 + -2x Solving 21 + 10x = 15 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + 10x + 2x = 15 + -2x + 2x Combine like terms: 10x + 2x = 12x 21 + 12x = 15 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 12x = 15 + 0 21 + 12x = 15 Add '-21' to each side of the equation. 21 + -21 + 12x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = 15 + -21 12x = 15 + -21 Combine like terms: 15 + -21 = -6 12x = -6 Divide each side by '12'. x = -0.5 Simplifying x = -0.5
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