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6u+15=-7(u-4)
We simplify the equation to the form, which is simple to understand
6u+15=-7(u-4)
Reorder the terms in parentheses
6u+15=+(-7u+28)
Remove unnecessary parentheses
+6u+15=-7u+28
We move all terms containing u to the left and all other terms to the right.
+6u+7u=+28-15
We simplify left and right side of the equation.
+13u=+13
We divide both sides of the equation by 13 to get u.
u=1
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