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450+15x=300+25x+20
We move all terms to the left:
450+15x-(300+25x+20)=0
We add all the numbers together, and all the variables
15x-(25x+320)+450=0
We get rid of parentheses
15x-25x-320+450=0
We add all the numbers together, and all the variables
-10x+130=0
We move all terms containing x to the left, all other terms to the right
-10x=-130
x=-130/-10
x=+13
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