1) (х+5)*3=3х+15 2) (9-у)*2=18-2у 3) (4х+6)*3=12х+18 4) (5-у)*8=40-8у 5) (7х+4)*4=28х+16 6) (2х+11)*6=12х+66
1) 3 2) 18-2y 3) 4x и 18 4) 5 и 8y 5) 4 и 28x 6) 6 и 66