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21-(3x+8)=0
We simplify the equation to the form, which is simple to understand
21-(3x+8)=0
Remove unnecessary parentheses
21-3x-8=0
We move all terms containing x to the left and all other terms to the right.
-3x=0-21+8
We simplify left and right side of the equation.
-3x=-13
We divide both sides of the equation by -3 to get x.
x=4.33333333333
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