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x in (-oo:+oo)
(-2/3)*x = 8/35 // - 8/35
(-2/3)*x-(8/35) = 0
(-2/3)*x-8/35 = 0
-2/3*x-8/35 = 0 // + 8/35
-2/3*x = 8/35 // : -2/3
x = 8/35/(-2/3)
x = -12/35
x = -12/35
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