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2x+x-2x-2-y=-3
2x-y=16
x-y=-1/*-2
2x-y=16
-2x+2y=2
------------
y=18
y=18
x-y=-1
y=18
x=17
x(x+1)-2(x+2)-y=-3 ^kwadrat
2x-y=16
2x+x-2x-4-y=-3
2x-y=16
x-4-y=-3
2x-y=16/*(-1)
x-y=1/*2
2x-y=16
2x-2y=2
-y=14/:-1
y=14
-2x+y=-16
x-y=1
-x=-15/:-1
x=15