Question

3^x = 9^x - 2
achar o valor de x​

Answer 1

$\displaystyle \mathsf{{3}^{x} = {9}^{x - 2}} \\ \displaystyle \mathsf{{3}^{x} = {3}^{2(x - 2)}} \\ \displaystyle \mathsf{x = 2x - 4} \\ \displaystyle \mathsf{ - x = - 4} \\ \displaystyle \mathsf{x = 4}$