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x in (-oo:+oo)
1/10-4*x = -159/10 // + -159/10
1/10-4*x-(-159/10) = 0
1/10-4*x+159/10 = 0
16-4*x = 0 // - 16
-4*x = -16 // : -4
x = -16/(-4)
x = 4
x = 4
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