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12u-78=6u
We simplify the equation to the form, which is simple to understand
12u-78=6u
We move all terms containing u to the left and all other terms to the right.
+12u-6u=+78
We simplify left and right side of the equation.
+6u=+78
We divide both sides of the equation by 6 to get u.
u=13
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