Line L1: ax + 2Y + 1 = 0 and line L2: (3-A) X-Y + a = 0, two lines parallel, then the value of a is, how to calculate!

A:
Line L1: ax + 2Y + 1 = 0, slope k = - A / 2
Line L2: (3-A) X-Y + a = 0, slope k = 3-A
The lines are parallel and the slopes are equal
k=-a/2=3-a
-a=6-2a
2a-a=6
a=6

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