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a) |x| -14= 15 -(-27)
|x|-14 = 15+27= 42
|x| = 42 + 14 = 56
=> x= 56 và (-56)
b) (x-28) + 7 = 15
x -28 = 15 -7 = 8
x = 28 + 8 = 36
\(\Leftrightarrow-\dfrac{2}{9}+\dfrac{2}{3}-\dfrac{4}{9}>=x>=\dfrac{3}{7}-\dfrac{7}{5}+\dfrac{11}{7}+\dfrac{2}{5}\)
=>0>=x>=1
=>\(x\in\varnothing\)
\(\frac{-\left(x+3\right)}{27}=\frac{11}{1-2y}=-\frac{121}{33}\)\(\Rightarrow\frac{-\left(x+3\right)}{27}=\frac{-121}{33}\)\(\Rightarrow-\left(x+3\right)=\left(-121\right)\cdot27\div33=-99\Rightarrow x+3=99\Rightarrow x=96\)
\(\frac{11}{1-2y}=\frac{-121}{33}\)\(\Rightarrow1-2y=33\cdot11\div\left(-121\right)=-3\Rightarrow2y=47\Rightarrow y=2\)
\(\frac{27}{23}+\frac{-4}{23}+\frac{1}{2}+\frac{-4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
\(\Rightarrow\frac{27}{23}-\frac{4}{23}+\frac{1}{2}-\frac{4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
\(\Rightarrow1+0< x< \frac{7}{3}+\frac{3}{3}\)
\(\Rightarrow1< x< \frac{10}{3}\)
\(\Rightarrow1< x< 3,333333333\)
\(\Rightarrow x\in\left\{2;3\right\}\)
Vậy : ....
ta co : \(\frac{27}{23}+\frac{-4}{23}+\frac{1}{2}+\frac{-4}{8}< x< \frac{7}{3}+\frac{13}{41}+\frac{28}{41}\)
=> \(1< x< \frac{10}{3}\)
vi x la so nguyen => \(1< x\le3\)
con lai ban tu lam
4x -(-7) = 27
=> 4x = 27 + (-7)
=> 4x = 20
=> x = 20:4
=> x =5
/x-1/ =0
=> x-1=0
=> x =0+1
=> x = 1