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5u+3=2u+21
We simplify the equation to the form, which is simple to understand
5u+3=2u+21
We move all terms containing u to the left and all other terms to the right.
+5u-2u=+21-3
We simplify left and right side of the equation.
+3u=+18
We divide both sides of the equation by 3 to get u.
u=6
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