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4(u-9)=7u-45
We move all terms to the left:
4(u-9)-(7u-45)=0
We multiply parentheses
4u-(7u-45)-36=0
We get rid of parentheses
4u-7u+45-36=0
We add all the numbers together, and all the variables
-3u+9=0
We move all terms containing u to the left, all other terms to the right
-3u=-9
u=-9/-3
u=+3
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