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(2+x)4=56
We move all terms to the left:
(2+x)4-(56)=0
We add all the numbers together, and all the variables
(x+2)4-56=0
We multiply parentheses
4x+8-56=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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