15y-12+9y=7-21y-28

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Solution for 15y-12+9y=7-21y-28 equation: 



15y-12+9y=7-21y-28

We move all terms to the left:

15y-12+9y-(7-21y-28)=0

We add all the numbers together, and all the variables

15y+9y-(-21y-21)-12=0

We add all the numbers together, and all the variables

24y-(-21y-21)-12=0

We get rid of parentheses

24y+21y+21-12=0

We add all the numbers together, and all the variables

45y+9=0

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

45y=-9

y=-9/45

y=-1/5

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