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a in (-oo:+oo)
-48/7 = (-3/5)*a+(3/7)*a-6 // - (-3/5)*a+(3/7)*a-6
6-((-3/5)*a)-((3/7)*a)-48/7 = 0
(3/5)*a+(-3/7)*a-48/7+6 = 0
6/35*a-6/7 = 0 // + 6/7
6/35*a = 6/7 // : 6/35
a = 6/7/6/35
a = 5
a = 5
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