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c in (-oo:+oo)
65 = (3*c)/(-7) // - (3*c)/(-7)
65-((3*c)/(-7)) = 0
(3/7)*c+65 = 0
3/7*c+65 = 0 // - 65
3/7*c = -65 // : 3/7
c = -65/3/7
c = -455/3
c = -455/3
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