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2(9x-19x)=20
We move all terms to the left:
2(9x-19x)-(20)=0
We add all the numbers together, and all the variables
2(-10x)-20=0
We multiply parentheses
-20x-20=0
We move all terms containing x to the left, all other terms to the right
-20x=20
x=20/-20
x=-1
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