Answer:
u = -

Explanation:
given the equation
6u + 7 - 2(- 3u - 1) = 6(u - 1) ← distribute parenthesis on both sides
6u + 7 + 6u + 2 = 6u - 6 ( simplify left side )
12u + 9 = 6u - 6 ( subtract 6u from both sides )
6u + 9 = - 6 ( subtract 9 from both sides )
6u = - 15 ( divide both sides by 6 )
u = -
= -
