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x in (-oo:+oo)
x-(2*((x-10000)/7)) = 0
(-2/7)*(x-10000)+x = 0
x-2/7*(x-10000) = 0
x-2/7*(x-10000) = 0
5/7*x+20000/7 = 0
5/7*x+20000/7 = 0
5/7*x+20000/7 = 0 // - 20000/7
5/7*x = -20000/7 // : 5/7
x = -20000/7/5/7
x = -4000
x = -4000
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