simplify 5x^3/7x^3+x^4
a- 5/7+x; where x does not equal 0, -7
b- 5/7+x; where x does not equal -7
c- 5/7x; where x does not equal 0
d- 5/7
a- 5/7+x; where x does not equal 0, -7
b- 5/7+x; where x does not equal -7
c- 5/7x; where x does not equal 0
d- 5/7