Today was the maths' day and the problem like this: 3x (a+b+c) = 66 If a=5, what does (b+c)/3 equal?
I urge you to explain to your child how to solve this type of equation. If your child knows basic mental maths, he should not have any problems with understanding this problem.
Hint: Stress that any number (or an unknown) that is moved from the left side of the equation to the right one, changes the sign.
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