Tìm x biết 5|x+1|/2=90/|x+1|

Tìm x

a) (35x23xx)17=5218\left(\dfrac{3}{5}x-\dfrac{2}{3}x-x\right)\cdot\dfrac{1}{7}=-\dfrac{5}{21}8

b) (5x1)(2x+13)=0\left(5x-1\right)\cdot\left(2x+\dfrac{1}{3}\right)=0

c) 5x+12=90x+1\dfrac{5\left|x+1\right|}{2}=\dfrac{90}{\left|x+1\right|}

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