Assuming you mean...
Addition: 9x
Subtraction: -x
Multiplication: 24x3
Division: 2/3x
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5x-2x-3x+4x = (5-2-3+4)x = 4x
4x
0.1053
It is a mathematical equation, usually written like this: 5x - 7 + 2x = 3x - 2 + 4x
if you mean (3/(2x-5))(21/(8x2-14x-15)) you would get (63/( (2x-5)(4x+3)(2x-5) ) simplified more would be 63/ ( (2x-5)2(4x+3) )