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820-75x=120+65x
We move all terms to the left:
820-75x-(120+65x)=0
We add all the numbers together, and all the variables
-75x-(65x+120)+820=0
We get rid of parentheses
-75x-65x-120+820=0
We add all the numbers together, and all the variables
-140x+700=0
We move all terms containing x to the left, all other terms to the right
-140x=-700
x=-700/-140
x=+5
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