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x+9=-39+7x
We move all terms to the left:
x+9-(-39+7x)=0
We add all the numbers together, and all the variables
x-(7x-39)+9=0
We get rid of parentheses
x-7x+39+9=0
We add all the numbers together, and all the variables
-6x+48=0
We move all terms containing x to the left, all other terms to the right
-6x=-48
x=-48/-6
x=+8
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