решите уравнение 1)х+4/21=2/3+2/7 2)у+1/4=4/5-3/10 3)(4/5-х)+13/20=7/10 4)2/3-(2/9+х)=1/3 напечатайте если сможете ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!!! даю 23 бала
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