x+15=-x-3

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Solution for x+15=-x-3 equation:


x+15=-x-3

We simplify the equation to the form, which is simple to understand 
x+15=-x-3

We move all terms containing x to the left and all other terms to the right. 
+1x+1x=-3-15

We simplify left and right side of the equation. 
+2x=-18

We divide both sides of the equation by 2 to get x. 
x=-9

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