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I would suggest either using 10x the regular amount of chlorine, or using a phosphate remover
10x - 5x + 5x = 10x
If you mean: -10x+4-10x+5 then it is 9-20x when simplified
Y = 10x 10x = 40 y = 40
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
-10x-6 = -12 -10x = -12+6 -10x = -6 x = 3/5
The total magnification would be 100x (10x optical zoom * 10x objective lens) for the microscope with a 10x optical and a 10x objective.
10x-8 = 2
It is: -4x-10x = -14x
10x-1476 = -1466
10x-10y = 0