Решите уравнения :
a) -3*(2.1x-4)-4,2=1,2*(-5x+0,5)
б) 6,4*(2-3y)=6*(0,8y-1)+6,8
в) 0.2(7)*(0,54-7,2y)-4/19*(0,76-3,8y)=0,002
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