Put all the terms on the left side: x2 - 6x - 112 = 0. Then use the quadratic formula, or find suitable factors. The quadratic formula is: If ax2 + bx + c = 0, then x = (-b plusminus root(b2 - 4ac)) / 2a; in this case, a = 1, b = -6, c = -112.
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