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210=0.5x-9.81
We simplify the equation to the form, which is simple to understand
210=0.5x-9.81
We move all terms containing x to the left and all other terms to the right.
-0.5x=-9.81-210
We simplify left and right side of the equation.
-0.5x=-219.81
We divide both sides of the equation by -00.5 to get x.
x=439.62
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