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a in (-oo:+oo)
-(2*a)-((3/5)*a)-4 = 6/5 // - 6/5
-(2*a)-((3/5)*a)-(6/5)-4 = 0
(-3/5)*a-2*a-6/5-4 = 0
-13/5*a-26/5 = 0 // + 26/5
-13/5*a = 26/5 // : -13/5
a = 26/5/(-13/5)
a = -2
a = -2
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