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c in (-oo:+oo)
(-1/8)*(c-4) = -4 // + 4
(-1/8)*(c-4)+4 = 0
4-1/8*(c-4) = 0
4-1/8*(c-4) = 0
9/2-1/8*c = 0
9/2-1/8*c = 0
9/2-1/8*c = 0 // - 9/2
-1/8*c = -9/2 // : -1/8
c = -9/2/(-1/8)
c = 36
c = 36
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