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7u+2+10u=-12+18u
We move all terms to the left:
7u+2+10u-(-12+18u)=0
We add all the numbers together, and all the variables
7u+10u-(18u-12)+2=0
We add all the numbers together, and all the variables
17u-(18u-12)+2=0
We get rid of parentheses
17u-18u+12+2=0
We add all the numbers together, and all the variables
-1u+14=0
We move all terms containing u to the left, all other terms to the right
-u=-14
u=-14/-1
u=+14
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