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x in (-oo:+oo)
10-x-(7*x) = -6 // + 6
6-x-(7*x)+10 = 0
6-x-7*x+10 = 0
16-8*x = 0 // - 16
-8*x = -16 // : -8
x = -16/(-8)
x = 2
x = 2
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