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x=-3+y
subs x=-3+y ke 2x+3y=8
2(-3+y)+3y=8
-6+2y+3y=8
-6+5y=8
5y=8+6
5y=14
y=14/5
x=-3+2y
=-3+2(14/5)
=-3+28/5
=13/5