How do i solve and simplify this if needed?

Abcd is a parallelogram. the diagram is not drawn to scale. if m

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )