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40000+72000+15x=130000+13x
We move all terms to the left:
40000+72000+15x-(130000+13x)=0
We add all the numbers together, and all the variables
15x-(13x+130000)+40000+72000=0
We add all the numbers together, and all the variables
15x-(13x+130000)+112000=0
We get rid of parentheses
15x-13x-130000+112000=0
We add all the numbers together, and all the variables
2x-18000=0
We move all terms containing x to the left, all other terms to the right
2x=18000
x=18000/2
x=9000
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