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0=ax+4
4=ax
a=4/x
x=4/a
y=(a+1)x-2
y=ax+x-2
0=ax+x-2
2=ax+x
a=2-x/x
2=ax+x
2-x=ax
2-x/a=x
x=2/a*2
x=4/a
2-x/x=4/x
2-x/x - 4/x=0
-2-x/x = 0
-2-x=0
x=2
2=4/a
2a=4
a=2 cnd.