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16x+12=21x-6
We move all terms to the left:
16x+12-(21x-6)=0
We get rid of parentheses
16x-21x+6+12=0
We add all the numbers together, and all the variables
-5x+18=0
We move all terms containing x to the left, all other terms to the right
-5x=-18
x=-18/-5
x=3+3/5
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