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x in (-oo:+oo)
(-1/2)*x-(5/3) = -8/7 // + -8/7
(-1/2)*x-(5/3)-(-8/7) = 0
(-1/2)*x-5/3+8/7 = 0
-1/2*x-11/21 = 0 // + 11/21
-1/2*x = 11/21 // : -1/2
x = 11/21/(-1/2)
x = -22/21
x = -22/21
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