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5u-9+9u+21=-2u-2
We move all terms to the left:
5u-9+9u+21-(-2u-2)=0
We add all the numbers together, and all the variables
14u-(-2u-2)+12=0
We get rid of parentheses
14u+2u+2+12=0
We add all the numbers together, and all the variables
16u+14=0
We move all terms containing u to the left, all other terms to the right
16u=-14
u=-14/16
u=-7/8
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