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x in (-oo:+oo)
7*x+1/3 = -20/3 // + -20/3
7*x+1/3-(-20/3) = 0
7*x+1/3+20/3 = 0
7*x+7 = 0 // - 7
7*x = -7 // : 7
x = -7/7
x = -1
x = -1
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