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