book Maths Puzzle Numerical Ability

How do i solve this equation?

3x+8+8x=9x-22

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book Other Question

A recipe for 2 1/2 dozen whole-wheat muffins requires 600 g of flour. How many muffins can be made with 900 g of flour? Put four different numbers in a circle so that when you add the numbers at the end of each line you always get a square number.
( where circle in the figure represents each of the