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-9x+4=21x-4
We move all terms to the left:
-9x+4-(21x-4)=0
We get rid of parentheses
-9x-21x+4+4=0
We add all the numbers together, and all the variables
-30x+8=0
We move all terms containing x to the left, all other terms to the right
-30x=-8
x=-8/-30
x=4/15
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