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x in (-oo:+oo)
(-2/3)*x = -6/7 // + -6/7
(-2/3)*x-(-6/7) = 0
(-2/3)*x+6/7 = 0
6/7-2/3*x = 0 // - 6/7
-2/3*x = -6/7 // : -2/3
x = -6/7/(-2/3)
x = 9/7
x = 9/7
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