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a in (-oo:+oo)
(4*a)/9 = 100/45 // - 100/45
(4*a)/9-(100/45) = 0
(4*a)/9-20/9 = 0
4/9*a-20/9 = 0 // + 20/9
4/9*a = 20/9 // : 4/9
a = 20/9/4/9
a = 5
a = 5
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