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x in (-oo:+oo)
3/10-(15/10) = (2/10)*x // - (2/10)*x
3/10-((2/10)*x)-(15/10) = 0
(-1/5)*x+3/10-3/2 = 0
-1/5*x-6/5 = 0 // + 6/5
-1/5*x = 6/5 // : -1/5
x = 6/5/(-1/5)
x = -6
x = -6
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