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3*7^x+3*7^x+1+7^x+2=219

Răspuns :

[tex]3*7^x+3* 7^{x+1}+ 7^{x+2} =219 \\ 7^x(3+21+49)=219 \\ 7^x*73=219 \\ 7^x=219:73 \\ 7^x=3 \\ x= log_{7}3 [/tex]