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x in (-oo:+oo)
1/5-((1/2)*x) = (9/10)*x // - (9/10)*x
1/5-((1/2)*x)-((9/10)*x) = 0
(-1/2)*x+(-9/10)*x+1/5 = 0
1/5-7/5*x = 0 // - 1/5
-7/5*x = -1/5 // : -7/5
x = -1/5/(-7/5)
x = 1/7
x = 1/7
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