Răspuns:
1
Explicație pas cu pas:
[tex]7^{x}+7*7^{x}-7+\dfrac{7^{x}}{7}-7=43~|*7,~~=>~7*7^{x}+49*7^{x}-49+7^{x}-49=43*7,~ =>~57*7^{x}=43*7+2*49,~=>~ 57*7^{x}=7*(43+2*7),~ 57*7^{x}=7*57,~=>~7^{x}=7,~=>~x=1[/tex]
