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Simplifying -1200(8) + -400(3) + X(12) = 0 Multiply -1200 * 8 -9600 + -400(3) + X(12) = 0 Multiply -400 * 3 -9600 + -1200 + X(12) = 0 Reorder the terms for easier multiplication: -9600 + -1200 + 12X = 0 Combine like terms: -9600 + -1200 = -10800 -10800 + 12X = 0 Solving -10800 + 12X = 0 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '10800' to each side of the equation. -10800 + 10800 + 12X = 0 + 10800 Combine like terms: -10800 + 10800 = 0 0 + 12X = 0 + 10800 12X = 0 + 10800 Combine like terms: 0 + 10800 = 10800 12X = 10800 Divide each side by '12'. X = 900 Simplifying X = 900
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