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x in (-oo:+oo)
x/3 = -6/7 // + -6/7
x/3-(-6/7) = 0
x/3+6/7 = 0
1/3*x+6/7 = 0 // - 6/7
1/3*x = -6/7 // : 1/3
x = -6/7/1/3
x = -18/7
x = -18/7
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