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x in (-oo:+oo)
x/4 = 18/5 // - 18/5
x/4-(18/5) = 0
x/4-18/5 = 0
1/4*x-18/5 = 0 // + 18/5
1/4*x = 18/5 // : 1/4
x = 18/5/1/4
x = 72/5
x = 72/5
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