Решите плез :з 
Уравнение. 


а) 2,3х-11,2/0,7 = 1,7х-9,4/ -2,1
б) 0,4*(6х-7)=0,5*(3х+7)
в)1/12у-1/9у-1/4у=1 2/3
г) 3/7 - 1/4х = 5 3/7-4х

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