Решите уравнение (8×+91):7=21 5у+3(7у+18)=106

1) (8*×+91):7=21, => 8*×+91=21*7, => 8*×+91=147, => 8*× = 147-91, => 8*× = 56, => × = 56/8, => × = 7, 2) 5*у+3(7*у+18)=106, => 5*у+3*7*у+3*18 =106, => 5*у+21*у+54=106, => 26*у = 106-54, => 26*у =52, => у =52/26, => у =2. Ответ: решения уравнений х=7, у=2.