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Simplifying
u2 + -7 + -18 = 0
Reorder the terms:
-7 + -18 + u2 = 0
Combine like terms: -7 + -18 = -25
-25 + u2 = 0
Solving
-25 + u2 = 0
Solving for variable 'u'.
Move all terms containing u to the left, all other terms to the right.
Add '25' to each side of the equation.
-25 + 25 + u2 = 0 + 25
Combine like terms: -25 + 25 = 0
0 + u2 = 0 + 25
u2 = 0 + 25
Combine like terms: 0 + 25 = 25
u2 = 25
Simplifying
u2 = 25
Take the square root of each side:
u = {-5, 5}
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