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-40x+18-15x+9-20x+3=180
We move all terms to the left:
-40x+18-15x+9-20x+3-(180)=0
We add all the numbers together, and all the variables
-75x-150=0
We move all terms containing x to the left, all other terms to the right
-75x=150
x=150/-75
x=-2
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