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-12=3.9+x
We simplify the equation to the form, which is simple to understand
-12=3.9+x
We move all terms containing x to the left and all other terms to the right.
-1x=+3.9+12
We simplify left and right side of the equation.
-1x=+15.9
We divide both sides of the equation by -01 to get x.
x=-15.9
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