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x in (-oo:+oo)
X-(8/3)+8/3 = -x/7 // + -x/7
X-(-x/7)-(8/3)+8/3 = 0
X+(1/7)*x-8/3+8/3 = 0
X+1/7*x = 0 // - X
1/7*x = -X // : 1/7
x = -X/1/7
x = -7*X
x = -7*X
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