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