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c in (-oo:+oo)
c/3+7 = 51/2 // - 51/2
c/3-(51/2)+7 = 0
c/3-51/2+7 = 0
1/3*c-37/2 = 0 // + 37/2
1/3*c = 37/2 // : 1/3
c = 37/2/1/3
c = 111/2
c = 111/2
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