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15103=+x
We move all terms to the left:
15103-(+x)=0
We get rid of parentheses
-x+15103=0
We add all the numbers together, and all the variables
-1x+15103=0
We move all terms containing x to the left, all other terms to the right
-x=-15103
x=-15103/-1
x=+15103
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