Determine a if the lines (a-3)*x + 2y-7=0 and x+(a+1)*y+2=0 are parallel.

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Two parallel lines have the same slope.

So we have to find the slope of (a-3)*x + 2y-7=0 and x+(a+1)*y+2=0

(a-3)*x + 2y-7=0

=> 2y = -(a - 3)x + 7

=> y = -(a -...

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