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2.1(y+0.4/2.1)-0.4=y
We move all terms to the left:
2.1(y+0.4/2.1)-0.4-(y)=0
We add all the numbers together, and all the variables
2.1(+y+0.4/2.1)-y-0.4=0
We add all the numbers together, and all the variables
-1y+2.1(+y+0.4/2.1)-0.4=0
We multiply parentheses
-1y+2.1y-0.4+0.4/2.1*2.1=0
We multiply all the terms by the denominator
-1y*2.1*2.1+(2.1y)*2.1*2.1+0.4-(0.4)*2.1*2.1=0
We add all the numbers together, and all the variables
-1y*2.1*2.1+(+2.1y)*2.1*2.1+0.4-(0.4)*2.1*2.1=0
We add all the numbers together, and all the variables
-1y*2.1*2.1+(+2.1y)*2.1*2.1-1.364=0
Wy multiply elements
-4.41y+(+2.1y)*2.1*2.1-1.364=0
We move all terms containing y to the left, all other terms to the right
-4.41y+(+2.1y)*2.1*2.1=1.364
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