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X in (-oo:+oo)
6*(6-X)+X/2 = 7 // - 7
6*(6-X)+X/2-7 = 0
(2*6*(6-X))/2+X/2+(-7*2)/2 = 0
2*6*(6-X)+X-7*2 = 0
72-11*X-14 = 0
58-11*X = 0
(58-11*X)/2 = 0
(58-11*X)/2 = 0 // * 2
58-11*X = 0
58-11*X = 0 // - 58
-11*X = -58 // : -11
X = -58/(-11)
X = 58/11
X = 58/11
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