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x in (-oo:+oo)
(2/5)*x-((5/3)*x) = 76 // - 76
(2/5)*x-((5/3)*x)-76 = 0
(2/5)*x+(-5/3)*x-76 = 0
-19/15*x-76 = 0 // + 76
-19/15*x = 76 // : -19/15
x = 76/(-19/15)
x = -60
x = -60
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