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40u/5-u-9=40
We move all terms to the left:
40u/5-u-9-(40)=0
We add all the numbers together, and all the variables
-1u+40u/5-49=0
We multiply all the terms by the denominator
-1u*5+40u-49*5=0
We add all the numbers together, and all the variables
40u-1u*5-245=0
Wy multiply elements
40u-5u-245=0
We add all the numbers together, and all the variables
35u-245=0
We move all terms containing u to the left, all other terms to the right
35u=245
u=245/35
u=7
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