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90+x+(x+4)=180
We move all terms to the left:
90+x+(x+4)-(180)=0
We add all the numbers together, and all the variables
x+(x+4)-90=0
We get rid of parentheses
x+x+4-90=0
We add all the numbers together, and all the variables
2x-86=0
We move all terms containing x to the left, all other terms to the right
2x=86
x=86/2
x=43
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