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5x-195=2x-21
We move all terms to the left:
5x-195-(2x-21)=0
We get rid of parentheses
5x-2x+21-195=0
We add all the numbers together, and all the variables
3x-174=0
We move all terms containing x to the left, all other terms to the right
3x=174
x=174/3
x=58
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