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-1x+3=9
We simplify the equation to the form, which is simple to understand
-1x+3=9
We move all terms containing x to the left and all other terms to the right.
-1x=+9-3
We simplify left and right side of the equation.
-1x=+6
We divide both sides of the equation by -1 to get x.
x=-6
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