The answer to this equation is 8 units.
In a parallelogram, opposite sides are parallel and also equal.
So,
If we construct a parallelogram ABCD, then side AB= side DC and
side BC= side AD.
As,
side AB= side DC
4q-8 = q+4
4q-q = 4+8
3q = 12
q = 4
Now, length of side AB= 4(4)-8= 8 units
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