3\displaystyle {3} 2\displaystyle {2} 7\displaystyle -{7}  
    (3y+3)\displaystyle {\left({3}{y}+{3}\right)} 7\displaystyle {7} (4x5)\displaystyle {\left({4}{x}-{5}\right)}  
=
           
    3\displaystyle {3} 2\displaystyle {2} (2z3)\displaystyle {\left({2}{z}-{3}\right)}  
    18\displaystyle {18} 7\displaystyle {7} 3\displaystyle {3}  

x=\displaystyle {x}=
y=\displaystyle {y}=
z=\displaystyle {z}=