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90+x+(x-30)=180
We move all terms to the left:
90+x+(x-30)-(180)=0
We add all the numbers together, and all the variables
x+(x-30)-90=0
We get rid of parentheses
x+x-30-90=0
We add all the numbers together, and all the variables
2x-120=0
We move all terms containing x to the left, all other terms to the right
2x=120
x=120/2
x=60
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