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-69=-1.3+u
We move all terms to the left:
-69-(-1.3+u)=0
We add all the numbers together, and all the variables
-(u-1.3)-69=0
We get rid of parentheses
-u+1.3-69=0
We add all the numbers together, and all the variables
-1u-67.7=0
We move all terms containing u to the left, all other terms to the right
-u=67.7
u=67.7/-1
u=-67+0.7/1
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