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3-x=3(5+4)
We move all terms to the left:
3-x-(3(5+4))=0
We add all the numbers together, and all the variables
-x+3-(39)=0
We add all the numbers together, and all the variables
-1x-36=0
We move all terms containing x to the left, all other terms to the right
-x=36
x=36/-1
x=-36
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