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20*x-(3*x)-100 = 5*(2/5) // - 5*(2/5)
20*x-(3*x)-(5*(2/5))-100 = 0
20*x-3*x-100-2 = 0
17*x-102 = 0 // + 102
17*x = 102 // : 17
x = 102/17
x = 6
x = 6
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