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x in (-oo:+oo)
x/2 = 1.4 // - 1.4
x/2-1.4 = 0
1/2*x-1.4 = 0 // + 1.4
1/2*x = 1.4 // : 1/2
x = 1.4/1/2
x = 2.8
x = 2.8
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