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19=-9+7x
We move all terms to the left:
19-(-9+7x)=0
We add all the numbers together, and all the variables
-(7x-9)+19=0
We get rid of parentheses
-7x+9+19=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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