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x in (-oo:+oo)
(3*x+6)/6+(x+6)/7 = 7 // - 7
(3*x+6)/6+(x+6)/7-7 = 0
(7*(3*x+6))/(6*7)+(6*(x+6))/(6*7)+(-7*6*7)/(6*7) = 0
7*(3*x+6)+6*(x+6)-7*6*7 = 0
27*x-294+78 = 0
27*x-216 = 0
(27*x-216)/(6*7) = 0
(27*x-216)/(6*7) = 0 // * 6*7
27*x-216 = 0
27*x-216 = 0 // + 216
27*x = 216 // : 27
x = 216/27
x = 8
x = 8
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