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12y-16=-21+10y
We move all terms to the left:
12y-16-(-21+10y)=0
We add all the numbers together, and all the variables
12y-(10y-21)-16=0
We get rid of parentheses
12y-10y+21-16=0
We add all the numbers together, and all the variables
2y+5=0
We move all terms containing y to the left, all other terms to the right
2y=-5
y=-5/2
y=-2+1/2
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