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x in (-oo:+oo)
10-7*x = 2*x-62 // - 2*x-62
10-7*x-(2*x)+62 = 0
10-7*x-2*x+62 = 0
72-9*x = 0 // - 72
-9*x = -72 // : -9
x = -72/(-9)
x = 8
x = 8
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