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-7-x=5-4x
We move all terms to the left:
-7-x-(5-4x)=0
We add all the numbers together, and all the variables
-x-(-4x+5)-7=0
We add all the numbers together, and all the variables
-1x-(-4x+5)-7=0
We get rid of parentheses
-1x+4x-5-7=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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