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205=25x+30
We move all terms to the left:
205-(25x+30)=0
We get rid of parentheses
-25x-30+205=0
We add all the numbers together, and all the variables
-25x+175=0
We move all terms containing x to the left, all other terms to the right
-25x=-175
x=-175/-25
x=+7
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