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Simplifying 10x + -9 = 12x + 21 Reorder the terms: -9 + 10x = 12x + 21 Reorder the terms: -9 + 10x = 21 + 12x Solving -9 + 10x = 21 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. -9 + 10x + -12x = 21 + 12x + -12x Combine like terms: 10x + -12x = -2x -9 + -2x = 21 + 12x + -12x Combine like terms: 12x + -12x = 0 -9 + -2x = 21 + 0 -9 + -2x = 21 Add '9' to each side of the equation. -9 + 9 + -2x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -2x = 21 + 9 -2x = 21 + 9 Combine like terms: 21 + 9 = 30 -2x = 30 Divide each side by '-2'. x = -15 Simplifying x = -15
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