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10x+9=-10x-9
We simplify the equation to the form, which is simple to understand
10x+9=-10x-9
We move all terms containing x to the left and all other terms to the right.
+10x+10x=-9-9
We simplify left and right side of the equation.
+20x=-18
We divide both sides of the equation by 20 to get x.
x=-0.9
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