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2u+6=-u-18
We simplify the equation to the form, which is simple to understand
2u+6=-u-18
We move all terms containing u to the left and all other terms to the right.
+2u+1u=-18-6
We simplify left and right side of the equation.
+3u=-24
We divide both sides of the equation by 3 to get u.
u=-8
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