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100=305+x
We move all terms to the left:
100-(305+x)=0
We add all the numbers together, and all the variables
-(x+305)+100=0
We get rid of parentheses
-x-305+100=0
We add all the numbers together, and all the variables
-1x-205=0
We move all terms containing x to the left, all other terms to the right
-x=205
x=205/-1
x=-205
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