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2x-7x+30=4x+39
We move all terms to the left:
2x-7x+30-(4x+39)=0
We add all the numbers together, and all the variables
-5x-(4x+39)+30=0
We get rid of parentheses
-5x-4x-39+30=0
We add all the numbers together, and all the variables
-9x-9=0
We move all terms containing x to the left, all other terms to the right
-9x=9
x=9/-9
x=-1
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