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x in (-oo:+oo)
-7 = 4*x-(7*x)-1 // - 4*x-(7*x)-1
7*x-(4*x)-7+1 = 0
7*x-4*x-7+1 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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