492. Решите уравнение: 1) 9b + 6b - 15 = 615;
2) 2а + 123а + 97 = 472;
3) 17x-x+ 5x - 19 = 170;
4) 73у - у - 22y + 40 = 190.
ПОМОГИТЕ ЭТО СРОЧНО!!!!!!!!!! ПОЖАЛУЙСТО!!!!!!!!!!!!​
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