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6u+(-19u)-(-15u)=-12
We simplify the equation to the form, which is simple to understand
6u+(-19u)-(-15u)=-12
Remove unnecessary parentheses
+6u-19u-(-15u+)=-12
Remove unnecessary parentheses
6u-19u+15u=-12
We move all terms containing u to the left and all other terms to the right.
+6u-19u+15u=-12
We simplify left and right side of the equation.
+2u=-12
We divide both sides of the equation by 2 to get u.
u=-6
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