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5x+(90+x)=180
We move all terms to the left:
5x+(90+x)-(180)=0
We add all the numbers together, and all the variables
5x+(x+90)-180=0
We get rid of parentheses
5x+x+90-180=0
We add all the numbers together, and all the variables
6x-90=0
We move all terms containing x to the left, all other terms to the right
6x=90
x=90/6
x=15
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