exam Maths Puzzle Numerical Ability

How do I solve the equation x/3-x-3/7=-1?

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exam Other Question

How much acid must be added to 40ml of a 20% solution to increase it to a 28% solution? This problem has been bothering me for a while now. I need help on how to solve it. It goes like this: If f(x)= 1-3x and g(x)= 1/ x^2 +1, find f(g(0)) and g(f(1))