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4x+12=-(x+3)
We simplify the equation to the form, which is simple to understand
4x+12=-(x+3)
Remove unnecessary parentheses
4x+12=-1x-3
We move all terms containing x to the left and all other terms to the right.
+4x+1x=-3-12
We simplify left and right side of the equation.
+5x=-15
We divide both sides of the equation by 5 to get x.
x=-3
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