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12=3x+4+4x
We move all terms to the left:
12-(3x+4+4x)=0
We add all the numbers together, and all the variables
-(7x+4)+12=0
We get rid of parentheses
-7x-4+12=0
We add all the numbers together, and all the variables
-7x+8=0
We move all terms containing x to the left, all other terms to the right
-7x=-8
x=-8/-7
x=1+1/7
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