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4*x+20 = 100/20-(50/25) // - 100/20-(50/25)
4*x-(100/20)+50/25+20 = 0
4*x+50/25-5+20 = 0
4*x+17 = 0 // - 17
4*x = -17 // : 4
x = -17/4
x = -17/4
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