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y-1=3x
x+2y=9
y=3x+1
x+2*(3x+1)=9
y=3x+1
x+6x+2=9
y=3x+1
7x=9-2
y=3x+1
7x=7 /:7
y=3x+1
x=1
y=3*1+1
x=1
y=4