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x in (-oo:+oo)
(-1/3)*x-7 = 11 // - 11
(-1/3)*x-11-7 = 0
-1/3*x-18 = 0 // + 18
-1/3*x = 18 // : -1/3
x = 18/(-1/3)
x = -54
x = -54
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