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