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x in (-oo:+oo)
-27 = x/4-7 // - x/4-7
7-(x/4)-27 = 0
-1/4*x-20 = 0 // + 20
-1/4*x = 20 // : -1/4
x = 20/(-1/4)
x = -80
x = -80
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