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21+(5x)=x
We simplify the equation to the form, which is simple to understand
21+(5x)=x
Remove unnecessary parentheses
+21+5x=+x
We move all terms containing x to the left and all other terms to the right.
+5x-1x=-21
We simplify left and right side of the equation.
+4x=-21
We divide both sides of the equation by 4 to get x.
x=-5.25
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