х*34+5-х*5497+х =                   <<-- упростим

= 5 + 34x - 5497x + x =

= 5 + (-5462)x               

если х=3

= 5 - 5462*3 = 5 - 16386 = - 16381

Verified answer

x*34+5-x*5497+x=3*34+5-3*5497+3=102+5-16491+3=-16381