3x+9=-4x-12

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Solution for 3x+9=-4x-12 equation:


3x+9=-4x-12

We simplify the equation to the form, which is simple to understand 
3x+9=-4x-12

We move all terms containing x to the left and all other terms to the right. 
+3x+4x=-12-9

We simplify left and right side of the equation. 
+7x=-21

We divide both sides of the equation by 7 to get x. 
x=-3

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