–17p–p–14p+11p–1=20
–7u–u+2u+11u=10
9j–6j+2j–4j=10
–18q+18q+2q+14=4
2c–12c+13c=12
65 x 55
12a–16a= –8
f(t,x,y) existence and uniqueness
5u–u+3u=14
8u–8u+u=4
