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x in (-oo:+oo)
x/(-4) = 6.5 // - 6.5
x/(-4)-6.5 = 0
-1/4*x-6.5 = 0 // + 6.5
-1/4*x = 6.5 // : -1/4
x = 6.5/(-1/4)
x = -26
x = -26
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