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3x+4(-x+7)=27
We move all terms to the left:
3x+4(-x+7)-(27)=0
We add all the numbers together, and all the variables
3x+4(-1x+7)-27=0
We multiply parentheses
3x-4x+28-27=0
We add all the numbers together, and all the variables
-1x+1=0
We move all terms containing x to the left, all other terms to the right
-x=-1
x=-1/-1
x=1
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