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Simplifying 0.4x + 0.7(12000 + -1x) = 720 0.4x + (12000 * 0.7 + -1x * 0.7) = 720 0.4x + (8400 + -0.7x) = 720 Reorder the terms: 8400 + 0.4x + -0.7x = 720 Combine like terms: 0.4x + -0.7x = -0.3x 8400 + -0.3x = 720 Solving 8400 + -0.3x = 720 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8400' to each side of the equation. 8400 + -8400 + -0.3x = 720 + -8400 Combine like terms: 8400 + -8400 = 0 0 + -0.3x = 720 + -8400 -0.3x = 720 + -8400 Combine like terms: 720 + -8400 = -7680 -0.3x = -7680 Divide each side by '-0.3'. x = 25600 Simplifying x = 25600
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