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