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45x+(57+x)=180
We move all terms to the left:
45x+(57+x)-(180)=0
We add all the numbers together, and all the variables
45x+(x+57)-180=0
We get rid of parentheses
45x+x+57-180=0
We add all the numbers together, and all the variables
46x-123=0
We move all terms containing x to the left, all other terms to the right
46x=123
x=123/46
x=2+31/46
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