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(56-s)4=80
We move all terms to the left:
(56-s)4-(80)=0
We add all the numbers together, and all the variables
(-1s+56)4-80=0
We multiply parentheses
-4s+224-80=0
We add all the numbers together, and all the variables
-4s+144=0
We move all terms containing s to the left, all other terms to the right
-4s=-144
s=-144/-4
s=+36
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