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The ratio is describing the weight of chlorine in relation to the weight of sodium.
If there is 54.41kg of chlorine there will also be 30kg of sodium.
54.41 + 30 = 84.41kg
For every 84.41kg of salt there will be 30kg of sodium. -->
30kg Sodium per 84.41kg Salt
144 = -12 (x+5)
We are solving for x. Follow the order of operations PEMDAS (parentheses, exponents, multiplication or division, addition or subtraction) to simplify the right side. So the first step is to work through the parentheses. -12 multiplied by each piece inside