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Simplifying 21(x + -3) = 12 Reorder the terms: 21(-3 + x) = 12 (-3 * 21 + x * 21) = 12 (-63 + 21x) = 12 Solving -63 + 21x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 21x = 12 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 12 + 63 21x = 12 + 63 Combine like terms: 12 + 63 = 75 21x = 75 Divide each side by '21'. x = 3.571428571 Simplifying x = 3.571428571
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