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x in (-oo:+oo)
(-2/1)*x = -4/1 // + -4/1
(-2/1)*x-(-4/1) = 0
4-2*x = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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