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-y/2+y-2y=-21
We move all terms to the left:
-y/2+y-2y-(-21)=0
We add all the numbers together, and all the variables
-1y-y/2+21=0
We multiply all the terms by the denominator
-1y*2-y+21*2=0
We add all the numbers together, and all the variables
-1y-1y*2+42=0
Wy multiply elements
-1y-2y+42=0
We add all the numbers together, and all the variables
-3y+42=0
We move all terms containing y to the left, all other terms to the right
-3y=-42
y=-42/-3
y=+14
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