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f in (-oo:+oo)
7-((2/3)*f) = 5 // - 5
7-((2/3)*f)-5 = 0
(-2/3)*f-5+7 = 0
2-2/3*f = 0 // - 2
-2/3*f = -2 // : -2/3
f = -2/(-2/3)
f = 3
f = 3
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