Решите уравнения: а) х-(50-х)=12      б) х+(х+1)+(х+2)=9     в) 21+(20-4х)-(11-2х)=0г) -5х+3(3+2х)=7 д) 2и-3(7-2и)=3    е) 2-2(х-8)=4х-4
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