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40+3x+4=8x+4
We move all terms to the left:
40+3x+4-(8x+4)=0
We add all the numbers together, and all the variables
3x-(8x+4)+44=0
We get rid of parentheses
3x-8x-4+44=0
We add all the numbers together, and all the variables
-5x+40=0
We move all terms containing x to the left, all other terms to the right
-5x=-40
x=-40/-5
x=+8
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