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c in (-oo:+oo)
c/1.5 = -2.9 // + 2.9
c/1.5+2.9 = 0
0.66666667*c+2.9 = 0 // - 2.9
0.66666667*c = -2.9 // : 0.66666667
c = -2.9/0.66666667
c = -4.34999998
c = -4.34999998
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