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Simplifying -12x + 21 = -10x Reorder the terms: 21 + -12x = -10x Solving 21 + -12x = -10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10x' to each side of the equation. 21 + -12x + 10x = -10x + 10x Combine like terms: -12x + 10x = -2x 21 + -2x = -10x + 10x Combine like terms: -10x + 10x = 0 21 + -2x = 0 Add '-21' to each side of the equation. 21 + -21 + -2x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 0 + -21 -2x = 0 + -21 Combine like terms: 0 + -21 = -21 -2x = -21 Divide each side by '-2'. x = 10.5 Simplifying x = 10.5
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