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Simplifying 21(3 + -1x) = 12 (3 * 21 + -1x * 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 = -51 -21x = -51 Divide each side by '-21'. x = 2.428571429 Simplifying x = 2.428571429
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