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a in (-oo:+oo)
2/3-((1/7)*a) = 47/84 // - 47/84
2/3-((1/7)*a)-(47/84) = 0
(-1/7)*a+2/3-47/84 = 0
3/28-1/7*a = 0 // - 3/28
-1/7*a = -3/28 // : -1/7
a = -3/28/(-1/7)
a = 3/4
a = 3/4
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