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13740=50x+21(421-x)
We simplify the equation to the form, which is simple to understand
13740=50x+21(421-x)
Reorder the terms in parentheses
13740=50x+(+8841-21x)
Remove unnecessary parentheses
+13740=+50x+8841-21x
We move all terms containing x to the left and all other terms to the right.
-50x+21x=+8841-13740
We simplify left and right side of the equation.
-29x=-4899
We divide both sides of the equation by -29 to get x.
x=168.931034483
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