X(64-13-1)=4300
X x 50 =4300
X=4300/50=86
64 x X - X x 13 - X = 4300
X x ( 64 - 13 - 1 ) = 4300
X x 50 = 4300
X = 4300 : 50
X = 86
64 x X - X x 13 - X = 4300
X x ( 64 - 13 - 1 ) = 4300
X x 50 = 4300
X = 4300 : 50
X = 86
64 x X - X x 13 - X = 4300
64 x X - X x 13 - X x 1 = 4300
X x ( 64 - 13 - 1 ) = 4300
X x 50 = 4300
X = 4300 : 50 = 86
= x - [64-13-1]=4300
= X-50=4300
X=4300+50
x=4350