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19+(x+8)=3x+9
We move all terms to the left:
19+(x+8)-(3x+9)=0
We get rid of parentheses
x-3x+8-9+19=0
We add all the numbers together, and all the variables
-2x+18=0
We move all terms containing x to the left, all other terms to the right
-2x=-18
x=-18/-2
x=+9
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