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x in (-oo:+oo)
3/10 = (1/5)*x // - (1/5)*x
3/10-((1/5)*x) = 0
(-1/5)*x+3/10 = 0
3/10-1/5*x = 0 // - 3/10
-1/5*x = -3/10 // : -1/5
x = -3/10/(-1/5)
x = 3/2
x = 3/2
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