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x in (-oo:+oo)
11 = 7*x+x+3 // - 7*x+x+3
11-(7*x)-x-3 = 0
11-7*x-x-3 = 0
8-8*x = 0 // - 8
-8*x = -8 // : -8
x = -8/(-8)
x = 1
x = 1
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