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x in (-oo:+oo)
x = (40/3)*x-7 // - (40/3)*x-7
x-((40/3)*x)+7 = 0
x+(-40/3)*x+7 = 0
7-37/3*x = 0 // - 7
-37/3*x = -7 // : -37/3
x = -7/(-37/3)
x = 21/37
x = 21/37
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