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x in (-oo:+oo)
(2*x)/5 = 3*x+7 // - 3*x+7
(2*x)/5-(3*x)-7 = 0
(2*x)/5-3*x-7 = 0
-13/5*x-7 = 0 // + 7
-13/5*x = 7 // : -13/5
x = 7/(-13/5)
x = -35/13
x = -35/13
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