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-40x+8-20x+3-15x+9=180
We move all terms to the left:
-40x+8-20x+3-15x+9-(180)=0
We add all the numbers together, and all the variables
-75x-160=0
We move all terms containing x to the left, all other terms to the right
-75x=160
x=160/-75
x=-2+2/15
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