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21x+75=29x+19
We move all terms to the left:
21x+75-(29x+19)=0
We get rid of parentheses
21x-29x-19+75=0
We add all the numbers together, and all the variables
-8x+56=0
We move all terms containing x to the left, all other terms to the right
-8x=-56
x=-56/-8
x=+7
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