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129=50+x
We move all terms to the left:
129-(50+x)=0
We add all the numbers together, and all the variables
-(x+50)+129=0
We get rid of parentheses
-x-50+129=0
We add all the numbers together, and all the variables
-1x+79=0
We move all terms containing x to the left, all other terms to the right
-x=-79
x=-79/-1
x=+79
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