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(-30-3x)+2x+20=180
We move all terms to the left:
(-30-3x)+2x+20-(180)=0
We add all the numbers together, and all the variables
(-3x-30)+2x+20-180=0
We add all the numbers together, and all the variables
2x+(-3x-30)-160=0
We get rid of parentheses
2x-3x-30-160=0
We add all the numbers together, and all the variables
-1x-190=0
We move all terms containing x to the left, all other terms to the right
-x=190
x=190/-1
x=-190
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