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2x+y=8
x+0,5y=n
y=-2x+8
x=-0,5y+n
y=-2(-0,5y+n)+8
x=-0,5(2x+8)
itd.
2.2x+3y=n/*(-3/2)
3x-2y=2
-3x-4,5y=n
3x-2y=2
-6,5y=n+2
itd.