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16x+9x-20=20x+15
We move all terms to the left:
16x+9x-20-(20x+15)=0
We add all the numbers together, and all the variables
25x-(20x+15)-20=0
We get rid of parentheses
25x-20x-15-20=0
We add all the numbers together, and all the variables
5x-35=0
We move all terms containing x to the left, all other terms to the right
5x=35
x=35/5
x=7
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