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(7-(5*x))/(-5) = (-5*x)/(-5) // - (-5*x)/(-5)
(7-(5*x))/(-5)-((-5*x)/(-5)) = 0
(7-5*x)/(-5)-x = 0
(7-5*x)/(-5)+(-5*(-x))/(-5) = 0
7-5*x-5*(-x) = 0
7 = 0
7/(-5) = 0
7/(-5) = 0 // * -5
7 = 0
7 = 0
x belongs to the empty set
x belongs to the empty set
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