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x in (-oo:+oo)
x/5+x/4 = 63/20 // - 63/20
x/5+x/4-(63/20) = 0
x/5+x/4-63/20 = 0
9/20*x-63/20 = 0 // + 63/20
9/20*x = 63/20 // : 9/20
x = 63/20/9/20
x = 7
x = 7
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