-0,5 * (y-4)/5 + 0,2 * (2-y)/2=9,5
-0,5 * (y-4)/5 + 0,2 * (2-y)/2=9,5 /*10
-0,5*2(y-4)+0,2*5(2-y)=95
-(y-4)+(2-y)=95
-y+4+2-y=95
-2y+6=95 /-6
-2y=89 /:(-2)
y=-44,5
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-0,5 * (y-4)/5 + 0,2 * (2-y)/2=9,5 /*10
-0,5*2(y-4)+0,2*5(2-y)=95
-(y-4)+(2-y)=95
-y+4+2-y=95
-2y+6=95 /-6
-2y=89 /:(-2)
y=-44,5