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a in (-oo:+oo)
3-(3*a) = (6/7)*a-(276/7) // - (6/7)*a-(276/7)
276/7-(3*a)-((6/7)*a)+3 = 0
(-6/7)*a-3*a+276/7+3 = 0
297/7-27/7*a = 0 // - 297/7
-27/7*a = -297/7 // : -27/7
a = -297/7/(-27/7)
a = 11
a = 11
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