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4-5x=7x+3
We move all terms to the left:
4-5x-(7x+3)=0
We get rid of parentheses
-5x-7x-3+4=0
We add all the numbers together, and all the variables
-12x+1=0
We move all terms containing x to the left, all other terms to the right
-12x=-1
x=-1/-12
x=1/12
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