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x in (-oo:+oo)
x/4-(4/5) = 19/20 // - 19/20
x/4-(4/5)-(19/20) = 0
x/4-4/5-19/20 = 0
1/4*x-7/4 = 0 // + 7/4
1/4*x = 7/4 // : 1/4
x = 7/4/1/4
x = 7
x = 7
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