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-315=-105+x
We move all terms to the left:
-315-(-105+x)=0
We add all the numbers together, and all the variables
-(x-105)-315=0
We get rid of parentheses
-x+105-315=0
We add all the numbers together, and all the variables
-1x-210=0
We move all terms containing x to the left, all other terms to the right
-x=210
x=210/-1
x=-210
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