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7+4u=70-3
We simplify the equation to the form, which is simple to understand
7+4u=70-3
We move all terms containing u to the left and all other terms to the right.
+4u=+70-3-7
We simplify left and right side of the equation.
+4u=+60
We divide both sides of the equation by 4 to get u.
u=15
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