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2(5+2x)=90
We move all terms to the left:
2(5+2x)-(90)=0
We add all the numbers together, and all the variables
2(2x+5)-90=0
We multiply parentheses
4x+10-90=0
We add all the numbers together, and all the variables
4x-80=0
We move all terms containing x to the left, all other terms to the right
4x=80
x=80/4
x=20
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