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c in (-oo:+oo)
5*(3-(c/7)) = 10 // - 10
5*(3-(c/7))-10 = 0
5*(3-1/7*c)-10 = 0
5*(3-1/7*c)-10 = 0
5-5/7*c = 0
5-5/7*c = 0
5-5/7*c = 0 // - 5
-5/7*c = -5 // : -5/7
c = -5/(-5/7)
c = 7
c = 7
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