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180=x+2x+10+4x-20
We move all terms to the left:
180-(x+2x+10+4x-20)=0
We add all the numbers together, and all the variables
-(7x-10)+180=0
We get rid of parentheses
-7x+10+180=0
We add all the numbers together, and all the variables
-7x+190=0
We move all terms containing x to the left, all other terms to the right
-7x=-190
x=-190/-7
x=27+1/7
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