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Simplifying 21x + -12 = 10x + -89 Reorder the terms: -12 + 21x = 10x + -89 Reorder the terms: -12 + 21x = -89 + 10x Solving -12 + 21x = -89 + 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. -12 + 21x + -10x = -89 + 10x + -10x Combine like terms: 21x + -10x = 11x -12 + 11x = -89 + 10x + -10x Combine like terms: 10x + -10x = 0 -12 + 11x = -89 + 0 -12 + 11x = -89 Add '12' to each side of the equation. -12 + 12 + 11x = -89 + 12 Combine like terms: -12 + 12 = 0 0 + 11x = -89 + 12 11x = -89 + 12 Combine like terms: -89 + 12 = -77 11x = -77 Divide each side by '11'. x = -7 Simplifying x = -7
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