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4x+35=8x-31
We move all terms to the left:
4x+35-(8x-31)=0
We get rid of parentheses
4x-8x+31+35=0
We add all the numbers together, and all the variables
-4x+66=0
We move all terms containing x to the left, all other terms to the right
-4x=-66
x=-66/-4
x=16+1/2
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