Answer :

Everest2017
AB = 4 x - 9
BC = 3 x + 5
AC = 7

B is in between A and C.  So AB + BC = AC

4x - 9 + 3 x + 5  =  7
7 x - 4 = 7              take -4 from LHS to the R H S (right hand side) it becomes +4
7 x = 7 + 4  = 11
x = 11/7    = 1.571

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