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x in (-oo:+oo)
(4/5)*x-19 = 76 // - 76
(4/5)*x-76-19 = 0
4/5*x-95 = 0 // + 95
4/5*x = 95 // : 4/5
x = 95/4/5
x = 475/4
x = 475/4
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