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x in (-oo:+oo)
(2/7)*x-((7/12)*x)-2 = 0
(2/7)*x+(-7/12)*x-2 = 0
-25/84*x-2 = 0 // + 2
-25/84*x = 2 // : -25/84
x = 2/(-25/84)
x = -168/25
x = -168/25
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