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21-124(3x)=14-124(2x)
We move all terms to the left:
21-124(3x)-(14-124(2x))=0
We add all the numbers together, and all the variables
-1243x-(-1242x+14)+21=0
We get rid of parentheses
-1243x+1242x-14+21=0
We add all the numbers together, and all the variables
-1x+7=0
We move all terms containing x to the left, all other terms to the right
-x=-7
x=-7/-1
x=+7
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