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75-2x=78-3x
We move all terms to the left:
75-2x-(78-3x)=0
We add all the numbers together, and all the variables
-2x-(-3x+78)+75=0
We get rid of parentheses
-2x+3x-78+75=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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