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4-(6-3)-3x=-20
We move all terms to the left:
4-(6-3)-3x-(-20)=0
We add all the numbers together, and all the variables
-3x+4-3-(-20)=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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