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c in (-oo:+oo)
6*c-(3.6/4) = -4/5 // + -4/5
6*c-(3.6/4)-(-4/5) = 0
6*c+4/5-0.9 = 0
6*c-0.1 = 0 // + 0.1
6*c = 0.1 // : 6
c = 0.1/6
c = 0.01666667
c = 0.01666667
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