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x in (-oo:+oo)
(x-6)/14 = (7*x)/21 // - (7*x)/21
(x-6)/14-((7*x)/21) = 0
(x-6)/14+(-1/3)*x = 0
(x-6)/14-x/3 = 0
(3*(x-6))/(3*14)+(14*(-x))/(3*14) = 0
3*(x-6)+14*(-x) = 0
-11*x-18 = 0
(-11*x-18)/(3*14) = 0
(-11*x-18)/(3*14) = 0 // * 3*14
-11*x-18 = 0
-11*x-18 = 0 // + 18
-11*x = 18 // : -11
x = 18/(-11)
x = -18/11
x = -18/11
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