a) Ta có: \(18-x=58-\left(-30\right)\)
\(\Leftrightarrow18-x=88\)
\(\Leftrightarrow x=18-88=-70\)
Vậy: x=-70
b) Ta có: \(x-27=\left(-43\right)-9\)
\(\Leftrightarrow x-27=-43-9\)
\(\Leftrightarrow x-27=-52\)
\(\Leftrightarrow x=-25\)
Vậy: x=-25
c) Ta có: \(169-\left(x+4\right)=69\)
\(\Leftrightarrow x+4=169-69\)
\(\Leftrightarrow x+4=100\)
\(\Leftrightarrow x=96\)
Vậy: x=96
d) Ta có: \(\left(5x+3\right)-\left(-24+4\right)=33\)
\(\Leftrightarrow5x+3+24-4-33=0\)
\(\Leftrightarrow5x-10=0\)
\(\Leftrightarrow5x=10\)
\(\Leftrightarrow x=2\)
Vậy: x=2
e) Ta có: \(225-\frac{\left(5x+10\right)}{25}+5=-\left(-20\right)\)
\(\Leftrightarrow225-\frac{5x+10}{25}+5-20=0\)
⇔\(-\frac{5x+10}{25}+210=0\)
\(\Leftrightarrow-\frac{5x+10}{25}=-210\)
⇔\(\frac{5x+10}{25}=210\)
\(\Leftrightarrow5x+10=210\cdot25=5250\)
\(\Leftrightarrow5x=5250-10=5240\)
\(\Leftrightarrow x=1048\)
Vậy: x=1048
e) 225 - ( 5x +10 ) : 25 +5 =-(-20)
225 - ( 5x +10 ) : 25 +5 = 20
( 5x +10 ) : 25 +5 =225 - 20
( 5x +10 ) : 25 +5= 205
( 5x +10 ) : 25= 205-5
( 5x +10 ) : 25= 200
( 5x +10 ) = 200 x 25
5x +10 = 5000
5x = 5000 - 10
5x = 4990
x = 4990 : 5
x = 998
a) 18-x=58-(-30)
18 - x = 58 + 30
18 - x = 138
x = 18 - 138
x = - 120
b)x - 27 = (-43)-9
x - 27 = -52
x = -52 + 27
x= - 25
c)169 -( x +4) = 69
x + 4 = 169 - 69
x+4 =100
x = 100 - 4
x = 96
d)(5x +3 ) - (-24 +4 )=33
(5x +3) +20 =33
5x +3 = 33-20
5x +3 = 13
5x = 13 - 3
5x = 10
x =10 : 5
x = 2
x
