Question 623329
If you mean
{{{(5a-3)/2- (3a-9)/8 = 6}}}
Multiply by 8
4*(5a-3) - (3a-9) = 48
20a - 12 - 3a + 9 = 48
17a = 51
a = 3
======
To check it, sub 3 for a
{{{(5a-3)/2- (3a-9)/8 = 6}}}
{{{(5*3-3)/2- (3*3-9)/8 = 6}}} ?
{{{(12)/2- (0)/8 = 6}}} ?
6 = 6