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x in (-oo:+oo)
(-1/6)*x+7 = (3/7)*x+22/21 // - (3/7)*x+22/21
(-1/6)*x-((3/7)*x)-(22/21)+7 = 0
(-1/6)*x+(-3/7)*x-22/21+7 = 0
125/21-25/42*x = 0 // - 125/21
-25/42*x = -125/21 // : -25/42
x = -125/21/(-25/42)
x = 10
x = 10
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