100-y=y*4

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Solution for 100-y=y*4 equation: 



100-y=y*4

We move all terms to the left:

100-y-(y*4)=0

We add all the numbers together, and all the variables

-y-(+y*4)+100=0

We add all the numbers together, and all the variables

-1y-(+y*4)+100=0

We get rid of parentheses

-1y-y*4+100=0

Wy multiply elements

-1y-4y+100=0

We add all the numbers together, and all the variables

-5y+100=0

We move all terms containing y to the left, all other terms to the right

-5y=-100

y=-100/-5

y=+20

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