book Maths Puzzle Numerical Ability

3=7(h-2)+17 i dont understand how to do this

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book Other Question

A 42-meter is to be cut into three pieces so that the second piece is twice as long as the first piece. If the third piece is 2 meters more than five times the first piece, find the length of each of the three piece. How do you find the solution of system to an equation?