![y=-\frac{x}{|x|}\\\\a)\; \; x>0\; \; \to \; \; |x|=x\; \; \to \; \; y=-\frac{x}{x}=-1\\\\b)\; \; x<0\; \; \to \; \; |x|=-x\; \; \to \; \; y=-\frac{x}{-x}=1\\\\c)\; \;x\ne 0](https://tex.z-dn.net/?f=y%3D-%5Cfrac%7Bx%7D%7B%7Cx%7C%7D%5C%5C%5C%5Ca%29%5C%3B+%5C%3B+x%3E0%5C%3B+%5C%3B+%5Cto+%5C%3B+%5C%3B+%7Cx%7C%3Dx%5C%3B+%5C%3B+%5Cto+%5C%3B+%5C%3B+y%3D-%5Cfrac%7Bx%7D%7Bx%7D%3D-1%5C%5C%5C%5Cb%29%5C%3B+%5C%3B+x%3C0%5C%3B+%5C%3B+%5Cto+%5C%3B+%5C%3B+%7Cx%7C%3D-x%5C%3B+%5C%3B+%5Cto+%5C%3B+%5C%3B+y%3D-%5Cfrac%7Bx%7D%7B-x%7D%3D1%5C%5C%5C%5Cc%29%5C%3B+%5C%3Bx%5Cne+0)
График нарисован красным цветом.
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2x-3x+7x=8+4+3
6x=15
x=15/6
x=2.1/3
(5x - 3) : 36 = 3 : 4
4 (5x - 3) = 3 * 36
4 (5x - 3) = 108
20x - 12 = 108
20x = 108 + 12
20x = 120
x = 6
4a^2-4ab-3b^2=4a(a-b)-3b^2