(300-х)*5=210
300-х=210/5
300-х=42
х=300-42
х=258
проверка
(300-258) *5=210
42*5=210
210=210
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(300-х)*5=210
300-х=210/5
300-х=42
х=300-42
х=258
проверка
(300-258) *5=210
42*5=210
210=210
-5х=210-1500
-5х=-1290
х=-1290÷(-5)
х=258