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y - II liczba
x = y +125
5( x -y) = x + y
x = y + 125
5x -5y -x -y = 0
x = y +125
5(y + 125) -5y - (y +125) -y = 0
x = y + 125
5y +625 -5y -y -125 - y = 0
x = y +125
-2y + 500 = 0
x = y + 125
-2y = -500
x = y + 125
y = 250
x = 250 + 125 = 375
y = 250
x = 375
y = 250
x-125=y
x+y=5x-5y
x-y=125
x-5x+y+5y=0
x-y=125
-4x+6y=0
x-y=125|*6
-4x+6y=0
6x-6y=750
2x=750|:2
x=375
x-125=y
x=375
375-125=y
x=375
y=250
x=375