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7x+12=5x+50
We move all terms to the left:
7x+12-(5x+50)=0
We get rid of parentheses
7x-5x-50+12=0
We add all the numbers together, and all the variables
2x-38=0
We move all terms containing x to the left, all other terms to the right
2x=38
x=38/2
x=19
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