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x in (-oo:+oo)
x/2 = 7/20 // - 7/20
x/2-(7/20) = 0
x/2-7/20 = 0
1/2*x-7/20 = 0 // + 7/20
1/2*x = 7/20 // : 1/2
x = 7/20/1/2
x = 7/10
x = 7/10
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