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x in (-oo:+oo)
(1/2)*x-(3/4) = 3/5 // - 3/5
(1/2)*x-(3/4)-(3/5) = 0
(1/2)*x-3/4-3/5 = 0
1/2*x-27/20 = 0 // + 27/20
1/2*x = 27/20 // : 1/2
x = 27/20/1/2
x = 27/10
x = 27/10
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