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a in (-oo:+oo)
36 = (9/16)*a // - (9/16)*a
36-((9/16)*a) = 0
(-9/16)*a+36 = 0
36-9/16*a = 0 // - 36
-9/16*a = -36 // : -9/16
a = -36/(-9/16)
a = 64
a = 64
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