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(7u + 10) - (3u - 12)=0
We simplify the equation to the form, which is simple to understand
(7u+10)-(3u-12)=0
Remove unnecessary parentheses
7u+10-(3u-12)=0
Remove unnecessary parentheses
7u+10-3u+12=0
We move all terms containing u to the left and all other terms to the right.
+7u-3u=0-10-12
We simplify left and right side of the equation.
+4u=-22
We divide both sides of the equation by 4 to get u.
u=-5.5
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