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2x+3y=0,5
3x+y=1
2x+3y=0,5
y=1 - 3x
2x + 3(1-3x)=0,5
y=1 - 3x
2x+3-9x=0.5
y=1 - 3x
-7x=-2.5/: -7
y=1 - 3x