23*(х-19)= 552
23х-437=552
23х=552+437
23х=989
х=989/23
х=43
15*( 2x+11)=285
30х+165=285
30х=285-165
30х=120
х=120/30
х=4
7*(123+4х)=749
861+28х=749
28х=749-861
28х=-112
х=-112/28
х=-4
23*(х-19)= 552
23х-437=552
23х=552+437
23х=989
х=989/23
х=43
15*( 2x+11)=285
30х+165=285
30х=285-165
30х=120
х=120/30
х=4
7*(123+4х)=749
861+28х=749
28х=749-861
28х=-112
х=-112/28
х=-4