135+(146-x)=401
146-x=401-135
146-x=66
x=146-66
x=80
135 + ( 146 - x) = 401
146 - x = 401 - 135 = 266
x = 146 - 266
x = -120
135+(146-x)=401
=>146-x=401-135
=>146-x=266
=>x=146-266
=>x=-120
135 + ( 146 - x ) = 401
( 146 - x ) = 401 - 135
146 - x = 266
=> x = 146 - 266
=> x = -120