4a-12a+4a3-10a+8a2-4a2+4a2-10a=8
4a-12a-10a-10a+4a3+8a2-4a2+4a2=8
-28a+4a3+8a2=8
a(-28+4a2+8a)=8
a(-28+4a2+8a)-8=0
4a-12a+4a3-10a+8a2-4a2+4a2-10a=8
4a-12a-10a-10a+4a3+8a2-4a2+4a2=8
-28a+4a3+8a2=8
a(-28+4a2+8a)=8
a(-28+4a2+8a)-8=0