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x in (-oo:+oo)
1/6 = (x-7)/12 // - (x-7)/12
1/6-((x-7)/12) = 0
(-1*(x-7))/12+1/6 = 0
(-1*6*(x-7))/(6*12)+(1*12)/(6*12) = 0
1*12-1*6*(x-7) = 0
54-6*x = 0
(54-6*x)/(6*12) = 0
(54-6*x)/(6*12) = 0 // * 6*12
54-6*x = 0
54-6*x = 0 // - 54
-6*x = -54 // : -6
x = -54/(-6)
x = 9
x = 9
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