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Simplifying 0.04 + 0.07(700 + -1x) = 420 0.04 + (700 * 0.07 + -1x * 0.07) = 420 0.04 + (49 + -0.07x) = 420 Combine like terms: 0.04 + 49 = 49.04 49.04 + -0.07x = 420 Solving 49.04 + -0.07x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-49.04' to each side of the equation. 49.04 + -49.04 + -0.07x = 420 + -49.04 Combine like terms: 49.04 + -49.04 = 0.00 0.00 + -0.07x = 420 + -49.04 -0.07x = 420 + -49.04 Combine like terms: 420 + -49.04 = 370.96 -0.07x = 370.96 Divide each side by '-0.07'. x = -5299.428571 Simplifying x = -5299.428571
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