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3.8=2.1-0.5y
We move all terms to the left:
3.8-(2.1-0.5y)=0
We add all the numbers together, and all the variables
-(-0.5y+2.1)+3.8=0
We get rid of parentheses
0.5y-2.1+3.8=0
We add all the numbers together, and all the variables
0.5y+1.7=0
We move all terms containing y to the left, all other terms to the right
0.5y=-1.7
y=-1.7/0.5
y=-3+0.2/0.5
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