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