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x in (-oo:+oo)
(4/5)*x-(6/5) = 7 // - 7
(4/5)*x-(6/5)-7 = 0
(4/5)*x-6/5-7 = 0
4/5*x-41/5 = 0 // + 41/5
4/5*x = 41/5 // : 4/5
x = 41/5/4/5
x = 41/4
x = 41/4
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