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u=3+(-5)
We simplify the equation to the form, which is simple to understand
u=3+(-5)
Remove unnecessary parentheses
+u=+3-5
We move all terms containing u to the left and all other terms to the right.
+1u=+3-5
We simplify left and right side of the equation.
+1u=-2
We divide both sides of the equation by 1 to get u.
u=-2
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