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x in (-oo:+oo)
x/4-x-(2/7) = 1 // - 1
x/4-x-(2/7)-1 = 0
x/4-x-2/7-1 = 0
-3/4*x-9/7 = 0 // + 9/7
-3/4*x = 9/7 // : -3/4
x = 9/7/(-3/4)
x = -12/7
x = -12/7
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