0.2(5y-2)=0.3(2y-1)-0.9

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0.2(5y-2)=0.3(2y-1)-0.9y-0.4 = 0.6y-0.3-0.9 y-0.4=0.6y-0.12y-0.6y= -0.12 + 0.40.4y = -0.8y = -0.8/0.4y = -2Ответ:у = -2