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