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x in (-oo:+oo)
(-1/3)*x-7 = 5 // - 5
(-1/3)*x-7-5 = 0
-1/3*x-12 = 0 // + 12
-1/3*x = 12 // : -1/3
x = 12/(-1/3)
x = -36
x = -36
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