1.(1.5x-8y)^2=( (1.5)^2 - 2*1.5x*8y+(8y)^2)=2.25x^2-24xy+64y^2
2.(-4+5y)^2=( (-4)+2*(-4)*5y+5y=16-40y+25y^2
4x+5/5+7=4x+5/12
3x/4=9x/12
4x+5/12=9x/12
4x+5=9x
5x=5
x=1