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3x+9=-11+7x
We move all terms to the left:
3x+9-(-11+7x)=0
We add all the numbers together, and all the variables
3x-(7x-11)+9=0
We get rid of parentheses
3x-7x+11+9=0
We add all the numbers together, and all the variables
-4x+20=0
We move all terms containing x to the left, all other terms to the right
-4x=-20
x=-20/-4
x=+5
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