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x in (-oo:+oo)
1/10 = (4/5)*x-(3/10) // - (4/5)*x-(3/10)
1/10-((4/5)*x)+3/10 = 0
(-4/5)*x+1/10+3/10 = 0
2/5-4/5*x = 0 // - 2/5
-4/5*x = -2/5 // : -4/5
x = -2/5/(-4/5)
x = 1/2
x = 1/2
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