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300-70x=4500-145x
We move all terms to the left:
300-70x-(4500-145x)=0
We add all the numbers together, and all the variables
-70x-(-145x+4500)+300=0
We get rid of parentheses
-70x+145x-4500+300=0
We add all the numbers together, and all the variables
75x-4200=0
We move all terms containing x to the left, all other terms to the right
75x=4200
x=4200/75
x=56
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