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115=105-x
We move all terms to the left:
115-(105-x)=0
We add all the numbers together, and all the variables
-(-1x+105)+115=0
We get rid of parentheses
1x-105+115=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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