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4((x+20)-2/3(x+20))=(x-20)+2/3(x+20)
4(x+20-2/3x-40/3=x-20+2/3x+40/3
4x+80-8/3x-160/3=x-20+2/3x+40/3
12/3x-8/3x-3/3x-2/3x=-60/3+40/3-240/3+160/3
-1/3x=-100/3 //(-1/3)
x=100
Panowie zaczeli grę z kwotą 100zł.