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3x(3+-4)=20
We move all terms to the left:
3x(3+-4)-(20)=0
We add all the numbers together, and all the variables
3x(-1)-20=0
We multiply parentheses
-3x-20=0
We move all terms containing x to the left, all other terms to the right
-3x=20
x=20/-3
x=-6+2/3
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