910 :(х+11)=355(2х+27)=405(5х+2х):2=252

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Let's solve this step by step:

Equation 1: (х+11) = 355
Subtract 11 from both sides:
х = 344

Equation 2: 355(2х+27) = 405
Expand:
710х + 9635 = 405
Subtract 9635 from both sides:
710х = -9230
Divide by 710:
х = -13

Equation 3: (5х+2х)/2 = 252
Combine like terms:
7х/2 = 252
Multiply by 2:
7х = 504
Divide by 7:
х = 72

Therefore, the correct value of x should be 72.