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x-2y+4=1/2x+3/4(y-1/2)
20*1/2y+20*1/4x-20*1/5(x+2)=20*1,1
x-2y+4=1/2x+3/4y-3/8|*8
10y+5x-4(x+2)=22
8x-16y+32=4x+6y-3
10y+5x-4x-8=22
8x-16y-4x-6y=-3-32
10y+x=30|*-4
-22y+4x=-35
-40y-4x=-120
-22y+4x=-35
I tutaj x się zredukował i wyszedł y
-62y=-155|:-62
y=2,5
-22*2,5+4x=-35
-55+4x=-35
4x=-35+55
4x=20|:4
x=5 :)