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180-x=0.8x
We move all terms to the left:
180-x-(0.8x)=0
We add all the numbers together, and all the variables
-x-(+0.8x)+180=0
We add all the numbers together, and all the variables
-1x-(+0.8x)+180=0
We get rid of parentheses
-1x-0.8x+180=0
We add all the numbers together, and all the variables
-1.8x+180=0
We move all terms containing x to the left, all other terms to the right
-1.8x=-180
x=-180/-1.8
x=+100
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