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-5x-21=-9x+47
We simplify the equation to the form, which is simple to understand
-5x-21=-9x+47
We move all terms containing x to the left and all other terms to the right.
-5x+9x=+47+21
We simplify left and right side of the equation.
+4x=+68
We divide both sides of the equation by 4 to get x.
x=17
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