2x - 5x (x - 2) = 13x

Linear or Non Linear

Non Linear

Explanation:

This appears to be a quadratic equation, not a linear.

Linear equations can be represented by the following:

Y=mx+b

Ax+By=C

Y-y1=m (x-x1)

This equation can't be represented as ANY of these. It is, however, able to be converted to the standard form of quadratic equations.