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15u*2-18u+35=0
We add all the numbers together, and all the variables
-18u+15u*2+35=0
Wy multiply elements
-18u+30u+35=0
We add all the numbers together, and all the variables
12u+35=0
We move all terms containing u to the left, all other terms to the right
12u=-35
u=-35/12
u=-2+11/12
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