(5/7)^2 divide by (5/7)^3x+1 = (5/7)^4
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(5/7)^2÷(5/7)^3x-1=(5/7)^4
(5/7)^2-(3x-1)=(5/7)^4
(5/7)^3-3x=(5/7)^4
3-3x=4
X=-1/3
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