-(1+7x)=3x-21

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Solution for -(1+7x)=3x-21 equation:


-(1+7x)=3x-21

We simplify the equation to the form, which is simple to understand 
-(1+7x)=3x-21

Remove unnecessary parentheses
-1-7x=3x-21

We move all terms containing x to the left and all other terms to the right. 
-7x-3x=-21+1

We simplify left and right side of the equation. 
-10x=-20

We divide both sides of the equation by -10 to get x. 
x=2

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