-3x+21=-4(x-4)

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Solution for -3x+21=-4(x-4) equation:


-3x+21=-4(x-4)

We simplify the equation to the form, which is simple to understand 
-3x+21=-4(x-4)

Reorder the terms in parentheses
-3x+21=+(-4x+16)

Remove unnecessary parentheses
-3x+21=-4x+16

We move all terms containing x to the left and all other terms to the right. 
-3x+4x=+16-21

We simplify left and right side of the equation. 
+1x=-5

We divide both sides of the equation by 1 to get x. 
x=-5

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