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x in (-oo:+oo)
-8 = x/(-7)-10 // - x/(-7)-10
10-(x/(-7))-8 = 0
1/7*x+2 = 0 // - 2
1/7*x = -2 // : 1/7
x = -2/1/7
x = -14
x = -14
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