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x in (-oo:+oo)
x/4-(x/5) = 9/4 // - 9/4
x/4-(x/5)-(9/4) = 0
x/4-(x/5)-9/4 = 0
1/20*x-9/4 = 0 // + 9/4
1/20*x = 9/4 // : 1/20
x = 9/4/1/20
x = 45
x = 45
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