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x in (-oo:+oo)
(-1/3)*x-7 = 13 // - 13
(-1/3)*x-13-7 = 0
-1/3*x-20 = 0 // + 20
-1/3*x = 20 // : -1/3
x = 20/(-1/3)
x = -60
x = -60
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