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x in (-oo:+oo)
7*x+1/5 = 8*x+4/5 // - 8*x+4/5
7*x-(8*x)+1/5-(4/5) = 0
7*x-8*x+1/5-4/5 = 0
-x-3/5 = 0 // + 3/5
-x = 3/5 // * -1
x = -3/5
x = -3/5
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