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180=79x+61x+40
We move all terms to the left:
180-(79x+61x+40)=0
We add all the numbers together, and all the variables
-(140x+40)+180=0
We get rid of parentheses
-140x-40+180=0
We add all the numbers together, and all the variables
-140x+140=0
We move all terms containing x to the left, all other terms to the right
-140x=-140
x=-140/-140
x=1
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