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25x+30(x-15)=405
We move all terms to the left:
25x+30(x-15)-(405)=0
We multiply parentheses
25x+30x-450-405=0
We add all the numbers together, and all the variables
55x-855=0
We move all terms containing x to the left, all other terms to the right
55x=855
x=855/55
x=15+6/11
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