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x in (-oo:+oo)
1/3-((1/2)*x) = (7/10)*x // - (7/10)*x
1/3-((1/2)*x)-((7/10)*x) = 0
(-1/2)*x+(-7/10)*x+1/3 = 0
1/3-6/5*x = 0 // - 1/3
-6/5*x = -1/3 // : -6/5
x = -1/3/(-6/5)
x = 5/18
x = 5/18
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