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20-7x=3x-9x+6
We move all terms to the left:
20-7x-(3x-9x+6)=0
We add all the numbers together, and all the variables
-7x-(-6x+6)+20=0
We get rid of parentheses
-7x+6x-6+20=0
We add all the numbers together, and all the variables
-1x+14=0
We move all terms containing x to the left, all other terms to the right
-x=-14
x=-14/-1
x=+14
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