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5x-300+15(100-x)=180
We move all terms to the left:
5x-300+15(100-x)-(180)=0
We add all the numbers together, and all the variables
5x+15(-1x+100)-300-180=0
We add all the numbers together, and all the variables
5x+15(-1x+100)-480=0
We multiply parentheses
5x-15x+1500-480=0
We add all the numbers together, and all the variables
-10x+1020=0
We move all terms containing x to the left, all other terms to the right
-10x=-1020
x=-1020/-10
x=+102
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