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21(x+5)=2163
We move all terms to the left:
21(x+5)-(2163)=0
We multiply parentheses
21x+105-2163=0
We add all the numbers together, and all the variables
21x-2058=0
We move all terms containing x to the left, all other terms to the right
21x=2058
x=2058/21
x=98
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