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a in (-oo:+oo)
3-((4/5)*a) = (-3*a)/4 // - (-3*a)/4
3-((4/5)*a)-((-3*a)/4) = 0
(-4/5)*a+(3/4)*a+3 = 0
3-1/20*a = 0 // - 3
-1/20*a = -3 // : -1/20
a = -3/(-1/20)
a = 60
a = 60
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