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a in (-oo:+oo)
(1/7)*a-3*a-(3/4) = -901/28 // + -901/28
(1/7)*a-3*a-(3/4)-(-901/28) = 0
(1/7)*a-3*a-3/4+901/28 = 0
220/7-20/7*a = 0 // - 220/7
-20/7*a = -220/7 // : -20/7
a = -220/7/(-20/7)
a = 11
a = 11
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