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7x=12-4(3)
We move all terms to the left:
7x-(12-4(3))=0
We add all the numbers together, and all the variables
7x-(-31)=0
We add all the numbers together, and all the variables
7x+31=0
We move all terms containing x to the left, all other terms to the right
7x=-31
x=-31/7
x=-4+3/7
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