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21=4(x+4)+x
We simplify the equation to the form, which is simple to understand
21=4(x+4)+x
Reorder the terms in parentheses
21=+(+4x+16)+x
Remove unnecessary parentheses
+21=+4x+16+x
We move all terms containing x to the left and all other terms to the right.
-4x-1x=+16-21
We simplify left and right side of the equation.
-5x=-5
We divide both sides of the equation by -5 to get x.
x=1
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