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x in (-oo:+oo)
(4/5)*x-7 = 1/5 // - 1/5
(4/5)*x-(1/5)-7 = 0
(4/5)*x-1/5-7 = 0
4/5*x-36/5 = 0 // + 36/5
4/5*x = 36/5 // : 4/5
x = 36/5/4/5
x = 9
x = 9
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