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275=4x+75
We move all terms to the left:
275-(4x+75)=0
We get rid of parentheses
-4x-75+275=0
We add all the numbers together, and all the variables
-4x+200=0
We move all terms containing x to the left, all other terms to the right
-4x=-200
x=-200/-4
x=+50
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