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x in (-oo:+oo)
-10 = 8-(-x/7) // - 8-(-x/7)
-x/7-10-8 = 0
-1/7*x-18 = 0 // + 18
-1/7*x = 18 // : -1/7
x = 18/(-1/7)
x = -126
x = -126
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