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-3x -5y = 7
3x-6y=6
-3x-5y=7
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-6y-5y=6+7
-11y=13/:(-11)
y= -13/11
y= -1 2/11
0,5x-y=1
0,5x-(-1 2/11)=1
0,5+1 2/11=1
0,5x=1-1 2/11
0,5x= -2/11/:0,5
x= -2/11:1/2
x= -2/11 * 2
x= -4/11