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12x+5=7x-30
We move all terms to the left:
12x+5-(7x-30)=0
We get rid of parentheses
12x-7x+30+5=0
We add all the numbers together, and all the variables
5x+35=0
We move all terms containing x to the left, all other terms to the right
5x=-35
x=-35/5
x=-7
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