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-6.9=u/3-2.1
We move all terms to the left:
-6.9-(u/3-2.1)=0
We get rid of parentheses
-u/3+2.1-6.9=0
We multiply all the terms by the denominator
-u+(2.1)*3-(6.9)*3=0
We add all the numbers together, and all the variables
-1u-14.4=0
We move all terms containing u to the left, all other terms to the right
-u=14.4
u=14.4/-1
u=-14+0.4/1
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