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7x+6=5x+30=
We move all terms to the left:
7x+6-(5x+30)=0
We get rid of parentheses
7x-5x-30+6=0
We add all the numbers together, and all the variables
2x-24=0
We move all terms containing x to the left, all other terms to the right
2x=24
x=24/2
x=12
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