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c in (-oo:+oo)
-4 = (-2/5)*c // - (-2/5)*c
-((-2/5)*c)-4 = 0
(2/5)*c-4 = 0
2/5*c-4 = 0 // + 4
2/5*c = 4 // : 2/5
c = 4/2/5
c = 10
c = 10
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