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105+105+2(105/2)=x
We move all terms to the left:
105+105+2(105/2)-(x)=0
We add all the numbers together, and all the variables
-x+105+105+2(+105/2)=0
We add all the numbers together, and all the variables
-1x+211=0
We move all terms containing x to the left, all other terms to the right
-x=-211
x=-211/-1
x=+211
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