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(8-x)+4x+x=130
We move all terms to the left:
(8-x)+4x+x-(130)=0
We add all the numbers together, and all the variables
(-1x+8)+4x+x-130=0
We add all the numbers together, and all the variables
5x+(-1x+8)-130=0
We get rid of parentheses
5x-1x+8-130=0
We add all the numbers together, and all the variables
4x-122=0
We move all terms containing x to the left, all other terms to the right
4x=122
x=122/4
x=30+1/2
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