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a in (-oo:+oo)
4.5 = (3*a)/4 // - (3*a)/4
4.5-((3*a)/4) = 0
(-3/4)*a+4.5 = 0
4.5-3/4*a = 0 // - 4.5
-3/4*a = -4.5 // : -3/4
a = -4.5/(-3/4)
a = 6
a = 6
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