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104=3x-1+4x
We move all terms to the left:
104-(3x-1+4x)=0
We add all the numbers together, and all the variables
-(7x-1)+104=0
We get rid of parentheses
-7x+1+104=0
We add all the numbers together, and all the variables
-7x+105=0
We move all terms containing x to the left, all other terms to the right
-7x=-105
x=-105/-7
x=+15
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