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