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x in (-oo:+oo)
106 = 7*x+7*x+8 // - 7*x+7*x+8
106-(7*x)-(7*x)-8 = 0
106-7*x-7*x-8 = 0
98-14*x = 0 // - 98
-14*x = -98 // : -14
x = -98/(-14)
x = 7
x = 7
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