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x in (-oo:+oo)
x/(-5) = 4-2 // - 4-2
x/(-5)-4+2 = 0
-1/5*x-2 = 0 // + 2
-1/5*x = 2 // : -1/5
x = 2/(-1/5)
x = -10
x = -10
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