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a in (-oo:+oo)
76/25 = (4/5)*a-4*a+4 // - (4/5)*a-4*a+4
76/25-(-4*a)-((4/5)*a)-4 = 0
4*a+(-4/5)*a+76/25-4 = 0
16/5*a-24/25 = 0 // + 24/25
16/5*a = 24/25 // : 16/5
a = 24/25/16/5
a = 3/10
a = 3/10
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