12y²-4y-15y+5-12y²-14y+42y+49+54=0
9y+108=0
9y= -108
y= -12
27^⅓-25^-½+16^¾-27^1⅓=3-1/5+8-81=-70-1/5=-70.2
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7 3/5:(3 1/2+2 5/6)=38/5:(3 3/6+2 5/6)=38/5:5 8/6=38/5:6 2/6=38/5:6 1/3=
=38/5:19/3=38/5*3/19=6/5=1 1/5