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80-x- pieniądze Karola
x-20%x=80-x-60%(80-x)+4
x-1/5x=80-x-3/5(80-x)+4
4/5x=80-x-48+3/5x+4
4/5x+x-3/5x=36
6/5x=36 |*(5/6)
x=30
80-x=80-30=50
Odp: Tomek miał 30 zł, a Karol 50 zł.