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Simplifying 120 + 0.8(y + -400) + 200 + 420 = 0 Reorder the terms: 120 + 0.8(-400 + y) + 200 + 420 = 0 120 + (-400 * 0.8 + y * 0.8) + 200 + 420 = 0 120 + (-320 + 0.8y) + 200 + 420 = 0 Reorder the terms: 120 + -320 + 200 + 420 + 0.8y = 0 Combine like terms: 120 + -320 = -200 -200 + 200 + 420 + 0.8y = 0 Combine like terms: -200 + 200 = 0 0 + 420 + 0.8y = 0 420 + 0.8y = 0 Solving 420 + 0.8y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-420' to each side of the equation. 420 + -420 + 0.8y = 0 + -420 Combine like terms: 420 + -420 = 0 0 + 0.8y = 0 + -420 0.8y = 0 + -420 Combine like terms: 0 + -420 = -420 0.8y = -420 Divide each side by '0.8'. y = -525 Simplifying y = -525
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