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x in (-oo:+oo)
(2/7)*x-((7/12)*x) = 3 // - 3
(2/7)*x-((7/12)*x)-3 = 0
(2/7)*x+(-7/12)*x-3 = 0
-25/84*x-3 = 0 // + 3
-25/84*x = 3 // : -25/84
x = 3/(-25/84)
x = -252/25
x = -252/25
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