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x in (-oo:+oo)
3/15 = (2*x)/20 // - (2*x)/20
3/15-((2*x)/20) = 0
(-1/10)*x+3/15 = 0
1/5-1/10*x = 0 // - 1/5
-1/10*x = -1/5 // : -1/10
x = -1/5/(-1/10)
x = 2
x = 2
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