12x+21=4x-21

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Solution for 12x+21=4x-21 equation:


12x+21=4x-21

We simplify the equation to the form, which is simple to understand 
12x+21=4x-21

We move all terms containing x to the left and all other terms to the right. 
+12x-4x=-21-21

We simplify left and right side of the equation. 
+8x=-42

We divide both sides of the equation by 8 to get x. 
x=-5.25

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