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15.05=2.15(u+2)
We move all terms to the left:
15.05-(2.15(u+2))=0
We calculate terms in parentheses: -(2.15(u+2)), so:We get rid of parentheses
2.15(u+2)
We multiply parentheses
2.15u+4.3
Back to the equation:
-(2.15u+4.3)
-2.15u-4.3+15.05=0
We add all the numbers together, and all the variables
-2.15u+10.75=0
We move all terms containing u to the left, all other terms to the right
-2.15u=-10.75
u=-10.75/-2.15
u=+5
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