решите уравнения (3y-7):5=33:15 35:(21-5y)=5:3 53:4=212:(6y-8)

1.(3y-7):5=33:15(3y-7):5=2,23y-7=2,2*53y-7=113y=11+73y=18y=18:3y=62.35:(21-5y)=5:321-5y=5:3*3521-5y=58-5y=58-21-5y=37y=37:(-5)y=-7,43.53:4=212:(6y-8)13,25=212:(6y-8)13,25*212=6y-82809=6y-82809+8=6y2817=6y2817:6=yy=469,5