Balls

Michal said to Martin: give me one ball and I'll have twice as you. Martin said: give me 4 and we will have equally.

How many balls each have?

Result

x =  19
y =  11

Solution: x+1 = 2(y-1)
(x-4) = y+ 4

x-2y = -3
x-y = 8

x = 19
y = 11

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