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-1.5=-0.8u+0.3u
We move all terms to the left:
-1.5-(-0.8u+0.3u)=0
We add all the numbers together, and all the variables
-(-0.5u)-1.5=0
We get rid of parentheses
0.5u-1.5=0
We move all terms containing u to the left, all other terms to the right
0.5u=1.5
u=1.5/0.5
u=3
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