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__1__ +

__1__ = 0

ax-1 bx-1

__taking L.C.M__

__(bx-1)+(ax-1)__

__=0__

__(ax-1)(bx-1)__

__bx-1+ax-1=0 [0*(ax-1)(bx-1)=0]__

__bx+ax-2=0__

__bx+ax=2__

__taking x as common__

__x(b+a)=2__

__x=__

__2__

__b+a__