2) 2(х+21)+3(х-4)=5(х+6)
2х+42+3х+12=5х-30
2х+3х-5х=-30-42-12
x =-84
3) 5(3х+4)-6(3х-7)=23х
15х-20-18х+42=23х
15х-18х-23х=20-42
−56х=−22+56
х=34
2) 2(х+21)+3(х-4)=5(х+6)
2х+42+3х+12=5х-30
2х+3х-5х=-30-42-12
x =-84
3) 5(3х+4)-6(3х-7)=23х
15х-20-18х+42=23х
15х-18х-23х=20-42
−56х=−22+56
х=34