Решите уравнения 4*(x+3)+7=30 9*(x-1)+3=66 21x+19-3x+17=72

1)4*(х+3)+7=304х+12+7=304х=30-12-74х=11х=11/4х=2 3/42)9*(х-1)+3=669х-9+3=669х=66+9-39х=72х=72:9х=83)21х+19-3х+17=7221х-3х=72-19-1718х=36х=36:18х=2