Решите уравнения
21z+50=85,
19-2z=93,
97-3z=72,
21 =69+6c
97=4z+37,
87=35+13y,
85=89+2z,
14=7x-35
Дам двадцать балов. Пожалуста распишите .
Вот образец
89=5x=49
5x=89-49
5x=40
x=40/5
x=8
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