123x+458+254х+26=1238
377x=1238-458-26
377x=754
x=754:377
x=2
2(6х+8)-3х=313
12x+16-3x=313
9x=313-16
9x=297
x=297:9
х=33
123x+458+254х+26=1238
377x=1238-458-26
377x=754
x=754:377
x=2
2(6х+8)-3х=313
12x+16-3x=313
9x=313-16
9x=297
x=297:9
х=33