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x in (-oo:+oo)
(1/2)*x+1 = 7/5 // - 7/5
(1/2)*x-(7/5)+1 = 0
(1/2)*x-7/5+1 = 0
1/2*x-2/5 = 0 // + 2/5
1/2*x = 2/5 // : 1/2
x = 2/5/1/2
x = 4/5
x = 4/5
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