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x in (-oo:+oo)
1.25-(x/2) = 5 // - 5
1.25-(x/2)-5 = 0
-1/2*x-3.75 = 0 // + 3.75
-1/2*x = 3.75 // : -1/2
x = 3.75/(-1/2)
x = -7.5
x = -7.5
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