6) [tex]5|x-y+3|+|-4|(y-2)^2=0\\
|x-y+3|\geqo\\
|-4|=4,(y-2)^2\geq 0 \rightarrow\\
x-y+3=0\\
y-2=0,\y=2\\
x=-3+2=-1[/tex]
7)
[tex]2^{58}=(2^2)^{29}=4^{29}\ \textgreater \ 3^{29}\\
|2^{58}-3^{29}|=4^{29}-3^{29}\\
a=4^{29}-4^{29}+3^{29}=3^{29}\\
b=(-2)^{20}\cdot2^9=2^{20}\cdot2^9=2^{29}\\
a\ \textgreater \ b[/tex]
