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c in (-oo:+oo)
(3/8)*(c+8) = -3/2 // + -3/2
(3/8)*(c+8)-(-3/2) = 0
(3/8)*(c+8)+3/2 = 0
3/8*(c+8)+3/2 = 0
(3/8*2*(c+8))/2+3/2 = 0
3/8*2*(c+8)+3 = 0
3/4*c+9 = 0
(3/4*c+9)/2 = 0
(3/4*c+9)/2 = 0 // * 2
3/4*c+9 = 0
3/4*c+9 = 0 // - 9
3/4*c = -9 // : 3/4
c = -9/3/4
c = -12
c = -12
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