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15(u-6)-18u=-12
We move all terms to the left:
15(u-6)-18u-(-12)=0
We add all the numbers together, and all the variables
-18u+15(u-6)+12=0
We multiply parentheses
-18u+15u-90+12=0
We add all the numbers together, and all the variables
-3u-78=0
We move all terms containing u to the left, all other terms to the right
-3u=78
u=78/-3
u=-26
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