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x in (-oo:+oo)
x/4-(x/5) = 3/10 // - 3/10
x/4-(x/5)-(3/10) = 0
x/4-(x/5)-3/10 = 0
1/20*x-3/10 = 0 // + 3/10
1/20*x = 3/10 // : 1/20
x = 3/10/1/20
x = 6
x = 6
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