12=-(x+4x)-3

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Solution for 12=-(x+4x)-3 equation:


12=-(x+4x)-3

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

Remove unnecessary parentheses
12=-5x-3

We move all terms containing x to the left and all other terms to the right. 
+5x=-3-12

We simplify left and right side of the equation. 
+5x=-15

We divide both sides of the equation by 05 to get x. 
x=-3

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