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1/3(18u-3u+21)=5+4u
We move all terms to the left:
1/3(18u-3u+21)-(5+4u)=0
Domain of the equation: 3(18u-3u+21)!=0We add all the numbers together, and all the variables
u∈R
1/3(15u+21)-(4u+5)=0
We get rid of parentheses
1/3(15u+21)-4u-5=0
We multiply all the terms by the denominator
-4u*3(15u+21)-5*3(15u+21)+1=0
Wy multiply elements
-12u^2(1-15u(1+1=0
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