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4x+(x+84)=180
We move all terms to the left:
4x+(x+84)-(180)=0
We get rid of parentheses
4x+x+84-180=0
We add all the numbers together, and all the variables
5x-96=0
We move all terms containing x to the left, all other terms to the right
5x=96
x=96/5
x=19+1/5
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