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