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a in (-oo:+oo)
28 = (3/4)*a+4 // - (3/4)*a+4
28-((3/4)*a)-4 = 0
(-3/4)*a-4+28 = 0
24-3/4*a = 0 // - 24
-3/4*a = -24 // : -3/4
a = -24/(-3/4)
a = 32
a = 32
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