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9x+4=5x+20=180
We move all terms to the left:
9x+4-(5x+20)=0
We get rid of parentheses
9x-5x-20+4=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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