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x in (-oo:+oo)
(1/5)*x = 7/10 // - 7/10
(1/5)*x-(7/10) = 0
(1/5)*x-7/10 = 0
1/5*x-7/10 = 0 // + 7/10
1/5*x = 7/10 // : 1/5
x = 7/10/1/5
x = 7/2
x = 7/2
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