7y+9=-8y-21

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Solution for 7y+9=-8y-21 equation:



7y+9=-8y-21
We move all terms to the left:
7y+9-(-8y-21)=0
We get rid of parentheses
7y+8y+21+9=0
We add all the numbers together, and all the variables
15y+30=0
We move all terms containing y to the left, all other terms to the right
15y=-30
y=-30/15
y=-2

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