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a in (-oo:+oo)
(3/4)*a-8 = (4/7)*a-(27/4) // - (4/7)*a-(27/4)
(3/4)*a-((4/7)*a)+27/4-8 = 0
(3/4)*a+(-4/7)*a+27/4-8 = 0
5/28*a-5/4 = 0 // + 5/4
5/28*a = 5/4 // : 5/28
a = 5/4/5/28
a = 7
a = 7
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