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20+30-x=30-5
We move all terms to the left:
20+30-x-(30-5)=0
We add all the numbers together, and all the variables
-x+20+30-25=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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