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2x+9=-4x-15
We simplify the equation to the form, which is simple to understand
2x+9=-4x-15
We move all terms containing x to the left and all other terms to the right.
+2x+4x=-15-9
We simplify left and right side of the equation.
+6x=-24
We divide both sides of the equation by 6 to get x.
x=-4
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