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2u-100=u-21
We simplify the equation to the form, which is simple to understand
2u-100=u-21
We move all terms containing u to the left and all other terms to the right.
+2u-1u=-21+100
We simplify left and right side of the equation.
+1u=+79
We divide both sides of the equation by 1 to get u.
u=79
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