5^2x - 7^x -35*5^2x + 35*7^x=0,
5^2x - 7^x -35(5^2x - 7^x)=0,
-34(5^2x - 7^x)=0,
(5^2)^x - 7^x=0,
(25/7)^x=1,
x=0
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5^2x - 7^x -35*5^2x + 35*7^x=0,
5^2x - 7^x -35(5^2x - 7^x)=0,
-34(5^2x - 7^x)=0,
(5^2)^x - 7^x=0,
(25/7)^x=1,
x=0