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3x+9=-5x-21
We simplify the equation to the form, which is simple to understand
3x+9=-5x-21
We move all terms containing x to the left and all other terms to the right.
+3x+5x=-21-9
We simplify left and right side of the equation.
+8x=-30
We divide both sides of the equation by 8 to get x.
x=-3.75
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