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x in (-oo:+oo)
x/3-(7*x) = 2/8 // - 2/8
x/3-(7*x)-(2/8) = 0
x/3-7*x-1/4 = 0
-20/3*x-1/4 = 0 // + 1/4
-20/3*x = 1/4 // : -20/3
x = 1/4/(-20/3)
x = -3/80
x = -3/80
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