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4=5x-1+7x
We move all terms to the left:
4-(5x-1+7x)=0
We add all the numbers together, and all the variables
-(12x-1)+4=0
We get rid of parentheses
-12x+1+4=0
We add all the numbers together, and all the variables
-12x+5=0
We move all terms containing x to the left, all other terms to the right
-12x=-5
x=-5/-12
x=5/12
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