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x in (-oo:+oo)
x/2+6*x+2 = 7 // - 7
x/2+6*x-7+2 = 0
13/2*x-5 = 0 // + 5
13/2*x = 5 // : 13/2
x = 5/13/2
x = 10/13
x = 10/13
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