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