Please solve the calculation

Dear Sir,

The equation is correct. see given below.

However based on the below calculation , the result was not came , while calculating manual the result was came.

while link the vale of "x" from below formula, then only the out put is incorrect. think some unit problem.

x1, x2, x - no unit as per the calculation P=14.7 psi, Ss:20000 pi, E :1.0 no unit.

Please clarify

Dear Sir,

Thank your for your immediate reply. however i will check the unit considereation.

regards

Robert