21y+3(90-13y)=180

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Solution for 21y+3(90-13y)=180 equation: 



21y+3(90-13y)=180

We move all terms to the left:

21y+3(90-13y)-(180)=0

We add all the numbers together, and all the variables

21y+3(-13y+90)-180=0

We multiply parentheses

21y-39y+270-180=0

We add all the numbers together, and all the variables

-18y+90=0

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

-18y=-90

y=-90/-18

y=+5

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