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180-3x=7x-20
We move all terms to the left:
180-3x-(7x-20)=0
We get rid of parentheses
-3x-7x+20+180=0
We add all the numbers together, and all the variables
-10x+200=0
We move all terms containing x to the left, all other terms to the right
-10x=-200
x=-200/-10
x=+20
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