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x in (-oo:+oo)
x/2-x-(3/7) = 2 // - 2
x/2-x-(3/7)-2 = 0
x/2-x-3/7-2 = 0
-1/2*x-17/7 = 0 // + 17/7
-1/2*x = 17/7 // : -1/2
x = 17/7/(-1/2)
x = -34/7
x = -34/7
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