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x in (-oo:+oo)
x/4-(x/5) = 9/5 // - 9/5
x/4-(x/5)-(9/5) = 0
x/4-(x/5)-9/5 = 0
1/20*x-9/5 = 0 // + 9/5
1/20*x = 9/5 // : 1/20
x = 9/5/1/20
x = 36
x = 36
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