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15x-29=13x+21
We move all terms to the left:
15x-29-(13x+21)=0
We get rid of parentheses
15x-13x-21-29=0
We add all the numbers together, and all the variables
2x-50=0
We move all terms containing x to the left, all other terms to the right
2x=50
x=50/2
x=25
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