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c in (-oo:+oo)
30-10 = (20/5)*c // - (20/5)*c
30-((20/5)*c)-10 = 0
30-4*c-10 = 0
20-4*c = 0 // - 20
-4*c = -20 // : -4
c = -20/(-4)
c = 5
c = 5
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