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Simplifying 21x + 12 = 9x + 7 Reorder the terms: 12 + 21x = 9x + 7 Reorder the terms: 12 + 21x = 7 + 9x Solving 12 + 21x = 7 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 12 + 21x + -9x = 7 + 9x + -9x Combine like terms: 21x + -9x = 12x 12 + 12x = 7 + 9x + -9x Combine like terms: 9x + -9x = 0 12 + 12x = 7 + 0 12 + 12x = 7 Add '-12' to each side of the equation. 12 + -12 + 12x = 7 + -12 Combine like terms: 12 + -12 = 0 0 + 12x = 7 + -12 12x = 7 + -12 Combine like terms: 7 + -12 = -5 12x = -5 Divide each side by '12'. x = -0.4166666667 Simplifying x = -0.4166666667
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