Solve the equation 2x (X-2) = 54, half X-11 = 29 + Half x 72 - (3-x) = 123 | Math enthusiast | Mathematical art

Solve the equation 2x (X-2) = 54, half X-11 = 29 + Half x 72 - (3-x) = 123

It is known that 2x ^ 2-4x = 54
That is, x ^ 2-2x-27 = 0
From the root formula, we get x 1 = 1 + 2 sqrt (7), x 2 = 1-2 sqrt (7)
(2) 1 / 2 * X-11 = 29 + 1 / 2 * x this seems to be a problem
（3） 72-(3-x)=123
That is 69 + x = 123
That is, x = 54

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