The answer is 3 because 4x-x=3x
10x = 4(2x -9)
10x = 8x - 36
10x - 8x = -36 - 8x
2x = -36
2x ÷ 2 = -36 ÷ 2
x = -18
If you need a better explanation just as in the comments.
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45x97=4365 hours, number of hours multiply by n of enmp
I supposed you are going to learn about area or volume, just remember length x width x height is volume and length x height is area
