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10x+5=3(5+7)
We move all terms to the left:
10x+5-(3(5+7))=0
We add all the numbers together, and all the variables
10x+5-(312)=0
We add all the numbers together, and all the variables
10x-307=0
We move all terms containing x to the left, all other terms to the right
10x=307
x=307/10
x=30+7/10
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