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x in (-oo:+oo)
0.5-(x/7) = 2.5 // - 2.5
0.5-(x/7)-2.5 = 0
-1/7*x-2 = 0 // + 2
-1/7*x = 2 // : -1/7
x = 2/(-1/7)
x = -14
x = -14
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