3050+36-a=1708
3086-a=1780
a=3086-1780
a=1306....
a-(2071-1049)=7085
a-1022=7085
a=7085+1022
a=8107...
a+1057+36=3800
a+1093=3800
a=3800-1093
a=2707...
(136+93)-x=1000-(736+200)
229-x=1000-936
229-x=64
x=229-64
x=165...
x+112-65=(118+365)-9
x+47=483-9
x+47=474
x=474-47
x=427...
990-75-x=88+106+33
915-x=227
x=915-227
x=688