Question

7x3^(x+1)-5^(x+2)=3^(x+4)-5^x+3)

Answer 1

$7* 3^{x+1}-5^{x+2}-3^{x+4}+5^{x+3}=0$
$7*3^{x}*3-5^{x}*25-3^{x}*81-5^{x}*125=0$
$3^{x}(21-81)-5^{x}(25-125)=0$
$-60*3^{x}=-100*5^{x}$
$3*3^{x}=5*5^{x}$
$3^{x+1}=5^{x+1}$
$=\ \textgreater \ x+1=0=\ \textgreater \ x=-1$