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7u+3-5u=-4u-9
We move all terms to the left:
7u+3-5u-(-4u-9)=0
We add all the numbers together, and all the variables
2u-(-4u-9)+3=0
We get rid of parentheses
2u+4u+9+3=0
We add all the numbers together, and all the variables
6u+12=0
We move all terms containing u to the left, all other terms to the right
6u=-12
u=-12/6
u=-2
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