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x in (-oo:+oo)
x-(5/3)+5/3 = -x/7 // + -x/7
x-(-x/7)-(5/3)+5/3 = 0
x+(1/7)*x-5/3+5/3 = 0
8/7*x = 0 // : 8/7
x = 0
x = 0
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