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x in (-oo:+oo)
(4/5)*x-1 = 6 // - 6
(4/5)*x-6-1 = 0
4/5*x-7 = 0 // + 7
4/5*x = 7 // : 4/5
x = 7/4/5
x = 35/4
x = 35/4
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