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-x=(-2.1)
We simplify the equation to the form, which is simple to understand
-x=(-2.1)
Remove unnecessary parentheses
-x=-2.1
We move all terms containing x to the left and all other terms to the right.
-1x=-2.1
We simplify left and right side of the equation.
-1x=-2.1
We divide both sides of the equation by -1 to get x.
x=2.1
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