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Simplifying 400 + 20(h + -40) = 640 Reorder the terms: 400 + 20(-40 + h) = 640 400 + (-40 * 20 + h * 20) = 640 400 + (-800 + 20h) = 640 Combine like terms: 400 + -800 = -400 -400 + 20h = 640 Solving -400 + 20h = 640 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + 20h = 640 + 400 Combine like terms: -400 + 400 = 0 0 + 20h = 640 + 400 20h = 640 + 400 Combine like terms: 640 + 400 = 1040 20h = 1040 Divide each side by '20'. h = 52 Simplifying h = 52
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