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x in (-oo:+oo)
x/4-(x/5) = 9/10 // - 9/10
x/4-(x/5)-(9/10) = 0
x/4-(x/5)-9/10 = 0
1/20*x-9/10 = 0 // + 9/10
1/20*x = 9/10 // : 1/20
x = 9/10/1/20
x = 18
x = 18
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