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180=30+4x+100-x+7x
We move all terms to the left:
180-(30+4x+100-x+7x)=0
We add all the numbers together, and all the variables
-(10x+130)+180=0
We get rid of parentheses
-10x-130+180=0
We add all the numbers together, and all the variables
-10x+50=0
We move all terms containing x to the left, all other terms to the right
-10x=-50
x=-50/-10
x=+5
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