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a in (-oo:+oo)
-((3/5)*a)-3/7 = (6/7)*a-(24/5) // - (6/7)*a-(24/5)
24/5-((3/5)*a)-((6/7)*a)-3/7 = 0
(-3/5)*a+(-6/7)*a-3/7+24/5 = 0
153/35-51/35*a = 0 // - 153/35
-51/35*a = -153/35 // : -51/35
a = -153/35/(-51/35)
a = 3
a = 3
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