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x in (-oo:+oo)
(5/6)*x-((1/5)*x)+4 = (7/10)*x // - (7/10)*x
(5/6)*x-((1/5)*x)-((7/10)*x)+4 = 0
(5/6)*x+(-1/5)*x+(-7/10)*x+4 = 0
4-1/15*x = 0 // - 4
-1/15*x = -4 // : -1/15
x = -4/(-1/15)
x = 60
x = 60
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