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