Need help with algebra homework

what are the steps to figure this out?
5(2X-3) - 3(X-4) ;X= 1/4

If I'm interpreting the question correctly, just replace every occurence of X in the expression with 1/4 and do the arithmetic.

5(2x - 3) - 3(x-4)
5(2*1/4 - 3) - 3(1/4 - 4)
5(2/4 - 3) - 3(1/4 - 4)
5(1-6)/2 - 3(1-16)/4
-25/2 + 45/4
-50/4 + 45/5
-5/4

10x - 15 - 3x +12 = ?

10 (1/4) - 15 - 3 (1/4) + 12 = ?

2.5 - 15 - .75 + 12 = ?

= - 1.25