Ответы на вопрос:
5^(x-1) =(5^x)/5 5^(x+1) =5^x *5 10*(5^x/5) +(5^x *5) =7 2*5^x +5^x *5 =7 5^x(2 +5) =7 5^x =7/7 5^x =1 5^x =5^0 x =0
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