Answer:
Answer in the pic with steps
Hope it helps
Move variables to the left by adding their opposites to both sides. Eliminate the opposites.
Move constants to the right by adding their opposites to both sides. Eliminate the opposites.
Collect the like terms by subtracting their coefficients and numbers.
Calculate the sum or difference. Extract the negative sign from the expression. Add the numbers.
Divide both sides of the equation by 5 and calculate the quotient.
The answer is d. if they are chemically joined as a mixture is multiple element but they aren't chemically joined. And an atom is what the element is made of and a solution is not anything to do with joined elements