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x in (-oo:+oo)
(-2/3)*x = -1/2 // + -1/2
(-2/3)*x-(-1/2) = 0
(-2/3)*x+1/2 = 0
1/2-2/3*x = 0 // - 1/2
-2/3*x = -1/2 // : -2/3
x = -1/2/(-2/3)
x = 3/4
x = 3/4
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