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5x+6=12x-4=4x+31
We move all terms to the left:
5x+6-(12x-4)=0
We get rid of parentheses
5x-12x+4+6=0
We add all the numbers together, and all the variables
-7x+10=0
We move all terms containing x to the left, all other terms to the right
-7x=-10
x=-10/-7
x=1+3/7
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