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-4x+9=-6x-21
We move all terms to the left:
-4x+9-(-6x-21)=0
We get rid of parentheses
-4x+6x+21+9=0
We add all the numbers together, and all the variables
2x+30=0
We move all terms containing x to the left, all other terms to the right
2x=-30
x=-30/2
x=-15
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