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x in (-oo:+oo)
(1/5)*x-(7/5) = -7 // + 7
(1/5)*x-(7/5)+7 = 0
(1/5)*x-7/5+7 = 0
1/5*x+28/5 = 0 // - 28/5
1/5*x = -28/5 // : 1/5
x = -28/5/1/5
x = -28
x = -28
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