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x+(75+x)=180
We move all terms to the left:
x+(75+x)-(180)=0
We add all the numbers together, and all the variables
x+(x+75)-180=0
We get rid of parentheses
x+x+75-180=0
We add all the numbers together, and all the variables
2x-105=0
We move all terms containing x to the left, all other terms to the right
2x=105
x=105/2
x=52+1/2
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