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