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180=5x-3+2x+21
We move all terms to the left:
180-(5x-3+2x+21)=0
We add all the numbers together, and all the variables
-(7x+18)+180=0
We get rid of parentheses
-7x-18+180=0
We add all the numbers together, and all the variables
-7x+162=0
We move all terms containing x to the left, all other terms to the right
-7x=-162
x=-162/-7
x=23+1/7
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