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-9=-51+x/4
We move all terms to the left:
-9-(-51+x/4)=0
We add all the numbers together, and all the variables
-(x/4-51)-9=0
We get rid of parentheses
-x/4+51-9=0
We multiply all the terms by the denominator
-x+51*4-9*4=0
We add all the numbers together, and all the variables
-1x+168=0
We move all terms containing x to the left, all other terms to the right
-x=-168
x=-168/-1
x=+168
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