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