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x in (-oo:+oo)
3-(10*x)-(1/5) = 1 // - 1
3-(10*x)-(1/5)-1 = 0
3-10*x-1/5-1 = 0
9/5-10*x = 0 // - 9/5
-10*x = -9/5 // : -10
x = -9/5/(-10)
x = 9/50
x = 9/50
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