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-2x+21=-30
We simplify the equation to the form, which is simple to understand
-2x+21=-30
We move all terms containing x to the left and all other terms to the right.
-2x=-30-21
We simplify left and right side of the equation.
-2x=-51
We divide both sides of the equation by -2 to get x.
x=25.5
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