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-3u=-15/4
We move all terms to the left:
-3u-(-15/4)=0
We get rid of parentheses
-3u+15/4=0
We multiply all the terms by the denominator
-3u*4+15=0
Wy multiply elements
-12u+15=0
We move all terms containing u to the left, all other terms to the right
-12u=-15
u=-15/-12
u=1+1/4
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