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-x+51=-99+9x
We simplify the equation to the form, which is simple to understand
-x+51=-99+9x
We move all terms containing x to the left and all other terms to the right.
-1x-9x=-99-51
We simplify left and right side of the equation.
-10x=-150
We divide both sides of the equation by -10 to get x.
x=15
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