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-78=124+x
We move all terms to the left:
-78-(124+x)=0
We add all the numbers together, and all the variables
-(x+124)-78=0
We get rid of parentheses
-x-124-78=0
We add all the numbers together, and all the variables
-1x-202=0
We move all terms containing x to the left, all other terms to the right
-x=202
x=202/-1
x=-202
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