done
3x - 19
--------------------------
x^2 + 7x - 2 ) 3x^3 + 2x^2 + 4x + 7
3x^3 + 21x^2 - 6x
-------------------
-19x^2 + 10x + 7
-19x^2 - 133x + 38
------------------
143x - 31