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48-8x=51-9x
We move all terms to the left:
48-8x-(51-9x)=0
We add all the numbers together, and all the variables
-8x-(-9x+51)+48=0
We get rid of parentheses
-8x+9x-51+48=0
We add all the numbers together, and all the variables
x-3=0
We move all terms containing x to the left, all other terms to the right
x=3
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