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x in (-oo:+oo)
x+(120/100)*x = 4000000 // - 4000000
x+(120/100)*x-4000000 = 0
11/5*x-4000000 = 0 // + 4000000
11/5*x = 4000000 // : 11/5
x = 4000000/11/5
x = 20000000/11
x = 20000000/11
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