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30=-6u+2(u-5)
We move all terms to the left:
30-(-6u+2(u-5))=0
We calculate terms in parentheses: -(-6u+2(u-5)), so:We get rid of parentheses
-6u+2(u-5)
We multiply parentheses
-6u+2u-10
We add all the numbers together, and all the variables
-4u-10
Back to the equation:
-(-4u-10)
4u+10+30=0
We add all the numbers together, and all the variables
4u+40=0
We move all terms containing u to the left, all other terms to the right
4u=-40
u=-40/4
u=-10
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