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250-25x=30+30x
We move all terms to the left:
250-25x-(30+30x)=0
We add all the numbers together, and all the variables
-25x-(30x+30)+250=0
We get rid of parentheses
-25x-30x-30+250=0
We add all the numbers together, and all the variables
-55x+220=0
We move all terms containing x to the left, all other terms to the right
-55x=-220
x=-220/-55
x=+4
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