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x in (-oo:+oo)
x-(7*x)+1 = 26/5 // - 26/5
x-(7*x)-(26/5)+1 = 0
x-7*x-26/5+1 = 0
-6*x-21/5 = 0 // + 21/5
-6*x = 21/5 // : -6
x = 21/5/(-6)
x = -7/10
x = -7/10
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