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6x+42=7x+3
We move all terms to the left:
6x+42-(7x+3)=0
We get rid of parentheses
6x-7x-3+42=0
We add all the numbers together, and all the variables
-1x+39=0
We move all terms containing x to the left, all other terms to the right
-x=-39
x=-39/-1
x=+39
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