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8+3u+7=-5u-9
We move all terms to the left:
8+3u+7-(-5u-9)=0
We add all the numbers together, and all the variables
3u-(-5u-9)+15=0
We get rid of parentheses
3u+5u+9+15=0
We add all the numbers together, and all the variables
8u+24=0
We move all terms containing u to the left, all other terms to the right
8u=-24
u=-24/8
u=-3
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