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5/2=7,5/3
2,5=2,5
x+2,5=y
5+2,5=7,5
x+2,5=y |*(-2)
3x-2y=0
-2x+2y=5
x=5
x+2,5=y
5+2,5=y
y=7,5
x=5
y=7,5
2,5=2,5
5+2,5=7,5