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20-4(2+3)=x
We move all terms to the left:
20-4(2+3)-(x)=0
We add all the numbers together, and all the variables
-x+20-45=0
We add all the numbers together, and all the variables
-1x-25=0
We move all terms containing x to the left, all other terms to the right
-x=25
x=25/-1
x=-25
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