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50x-30=75x-105
We move all terms to the left:
50x-30-(75x-105)=0
We get rid of parentheses
50x-75x+105-30=0
We add all the numbers together, and all the variables
-25x+75=0
We move all terms containing x to the left, all other terms to the right
-25x=-75
x=-75/-25
x=+3
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