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-7x-12=9x+3
We move all terms to the left:
-7x-12-(9x+3)=0
We get rid of parentheses
-7x-9x-3-12=0
We add all the numbers together, and all the variables
-16x-15=0
We move all terms containing x to the left, all other terms to the right
-16x=15
x=15/-16
x=-15/16
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