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-3\\\\
3log_{4}(x+3)=-3log_{4}(x+3)+8log_{4}(x+3)+9\\\\
x+3=t\\\\
3log_{4}t=-3log_{4}t+8log_{4}t+9\\\\
6log_{4}t=8log_{4}t+9\\\\
-2log_{4}t=9\\\\
log_{4}t=-4.5\\\\
t=\frac{1}{512}\\\\
x=\frac{1}{512}-3\\\\
x=\frac{ -1535 }{512}
" alt="log_{4}(x+3)^3=-3log_{4}|x+3|+log_{4}(x+3)^8+9\\\\
x>-3\\\\
3log_{4}(x+3)=-3log_{4}(x+3)+8log_{4}(x+3)+9\\\\
x+3=t\\\\
3log_{4}t=-3log_{4}t+8log_{4}t+9\\\\
6log_{4}t=8log_{4}t+9\\\\
-2log_{4}t=9\\\\
log_{4}t=-4.5\\\\
t=\frac{1}{512}\\\\
x=\frac{1}{512}-3\\\\
x=\frac{ -1535 }{512}
" align="absmiddle" class="latex-formula">