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a in (-oo:+oo)
3*a-((3/4)*a)-4 = 0
3*a+(-3/4)*a-4 = 0
9/4*a-4 = 0 // + 4
9/4*a = 4 // : 9/4
a = 4/9/4
a = 16/9
a = 16/9
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