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x in (-oo:+oo)
-7*x-18 = 281/2 // - 281/2
-7*x-(281/2)-18 = 0
-7*x-281/2-18 = 0
-7*x-317/2 = 0 // + 317/2
-7*x = 317/2 // : -7
x = 317/2/(-7)
x = -317/14
x = -317/14
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