a) (x - 7) + 5 = 16
=> x - 7 = 11
=> x = 18
b) 4 : x - 34 = 6
=> 4 : x = 40
=> x = \(\frac{1}{10}\)
c) 120 : ( x - 1 ) + 3 = 23
=> 120 : ( x - 1 ) = 20
=> x - 1 = 6
=> x = 7
d) 170 - ( x-7) : 5 = 20
=> ( x - 7 ) : 5 = 150
=> x - 7 = 750
=> x = 757
e) x + 12 + 2 .x + 3 = 4.x + 3
=> 3x + 17 = 4x + 3
=> x = 15
\(a,x-7=11\)
\(x=18\)
\(b,x-36=\frac{2}{3}\)
\(x=\frac{110}{3}\)
\(c,120:\left(x-1\right)=20\)
\(x-1=6\)
\(x=7\)
\(d,\left(x-7\right):5=150\)
\(x-7=10\)
\(x=17\)
\(d,x+12+2.x+3-4.x-3=0\)
\(x.\left(1+2-4\right)+3-3+12=0\)
\(x.\left(-1\right)+12=0\)
\(x.\left(-1\right)=-12\)
\(x=12\)
a) (x - 7) + 5 = 16
x - 7 = 16 - 5
x - 7 = 11
x = 11 + 7
x = 18
b) 4 : x - 34 = 6
4 : x = 6 + 34
4 : x = 40
x = 4 : 40
x = 1/10
c) 120 : ( x - 1 ) + 3 =23
120 : ( x - 1 ) = 23 +3
120 : ( x - 1 ) =26
x -1 = 120 :26
x - 1 =13/60
x = 13/60 + 1
x = 73/60
d) 170 - ( x - 7 ) :5 =20
170 - ( x - 7 ) = 20:5
170 - ( x - 7 ) =4
x- 7 = 170 - 4
x - 7 = 166
x = 166 + 7
x = 173
còn câu e mik ko bt làm nhé mà k cho mik nhé
