a≠0 x≠0
a+ax+b+x+abx=0
ax+x+abx=-a-b
(a+1+ab)x=-a-b
(a+1+ab)≠0
x=(-a-b)/(a+1+ab)
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a≠0 x≠0
a+ax+b+x+abx=0
ax+x+abx=-a-b
(a+1+ab)x=-a-b
(a+1+ab)≠0
x=(-a-b)/(a+1+ab)
x(a+1+ab)=-a-b;
a+ab+1≠0
x=-(a+b)/(ab+a+1)