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2x+x+3=9
y=x+3
3x=9-3
y=x+3
x=2
x=2
y=5
5x+6y=8
x=-1+4y
-5+26y=8
x=-1+4y
26y=8+5
x=-1+4y
y=1/2
x=-1+2
x=1
y=1/2