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9x+39=19x+30
We move all terms to the left:
9x+39-(19x+30)=0
We get rid of parentheses
9x-19x-30+39=0
We add all the numbers together, and all the variables
-10x+9=0
We move all terms containing x to the left, all other terms to the right
-10x=-9
x=-9/-10
x=9/10
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