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x in (-oo:+oo)
36 = 6*x+x+8 // - 6*x+x+8
36-(6*x)-x-8 = 0
36-6*x-x-8 = 0
28-7*x = 0 // - 28
-7*x = -28 // : -7
x = -28/(-7)
x = 4
x = 4
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