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x in (-oo:+oo)
x-(3/10) = 4*x // - 4*x
x-(4*x)-(3/10) = 0
x-4*x-3/10 = 0
-3*x-3/10 = 0 // + 3/10
-3*x = 3/10 // : -3
x = 3/10/(-3)
x = -1/10
x = -1/10
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