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x in (-oo:+oo)
(4/5)*x-(7/10) = (5/6)*x // - (5/6)*x
(4/5)*x-((5/6)*x)-(7/10) = 0
(4/5)*x+(-5/6)*x-7/10 = 0
-1/30*x-7/10 = 0 // + 7/10
-1/30*x = 7/10 // : -1/30
x = 7/10/(-1/30)
x = -21
x = -21
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