The value of x is equal to 7.
Quadrilaterals
There are different types of quadrilaterals, for example: square, rectangle, rhombus, trapezoid and parallelogram. Each type is defined accordingly to its length of sides and angles. For example, the opposite sides for a parallelogram are equal and parallel.
Considering that the opposite sides of the parallelogram (ABCD) are equal and parallel, so AD=DC. Therefore,
5x+3=38
5x=38-3
5x=35
x=7
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