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x in (-oo:+oo)
(-2/3)*x-7 = 13 // - 13
(-2/3)*x-13-7 = 0
-2/3*x-20 = 0 // + 20
-2/3*x = 20 // : -2/3
x = 20/(-2/3)
x = -30
x = -30
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