1) 15*(2х*11)=285 2) 7*(123-4х)=749

1) 15(2х+11) = 258 30х+165 = 258 30х = 258-165 30х = 93 х = 93 / 30 х = 3.1 2) 7(123-4х)=749 123-4х=749\7 123-4х=107 4х=123-107 4х=16 х=16\4 х=4