20(105-y)+5y=1200

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Solution for 20(105-y)+5y=1200 equation: 



20(105-y)+5y=1200

We move all terms to the left:

20(105-y)+5y-(1200)=0

We add all the numbers together, and all the variables

20(-1y+105)+5y-1200=0

We add all the numbers together, and all the variables

5y+20(-1y+105)-1200=0

We multiply parentheses

5y-20y+2100-1200=0

We add all the numbers together, and all the variables

-15y+900=0

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

-15y=-900

y=-900/-15

y=+60

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