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x in (-oo:+oo)
(-1/3)*x-(6/7) = -13/7 // + -13/7
(-1/3)*x-(6/7)-(-13/7) = 0
(-1/3)*x-6/7+13/7 = 0
1-1/3*x = 0 // - 1
-1/3*x = -1 // : -1/3
x = -1/(-1/3)
x = 3
x = 3
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