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x in (-oo:+oo)
(4/3)*x-((5/2)*x) = 7 // - 7
(4/3)*x-((5/2)*x)-7 = 0
(4/3)*x+(-5/2)*x-7 = 0
-7/6*x-7 = 0 // + 7
-7/6*x = 7 // : -7/6
x = 7/(-7/6)
x = -6
x = -6
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