x=5
-3(x+5)-7(5-2x)=5
(nhan don thuc voi da thuc_lop 8)
-3x-15-35+14x-5=0 (chuyen 5 sang)
11x-55=0 (cong cac so co bien x ; cac so khong co bien voi nhau)
11x=55 (chuyen 55 sang)
x=55:11
x=5
Tìm x biết:
a)(2x-3)-(x-5)=(x+7)-(x+2)
b)(7x-5)-(6x+4)+(2x+3)-(2x+1)
c)(9x-3)-(8x+5)=(3x+2)
d)(x+7)-(2x+3)=(3x+5)-(2x+4)
tìm x, biết:
\(\frac{7^{x-2}+7^{x-10}+7^x}{57}=\frac{5^{2x}+5^{2x-1}+5^{2x+3}}{131}\)
Tìm x biết: -3(x+5)-7(5-2x)=5
tìm x thuộc Z biết :
a)|3x+5|-2(x+7)-4(7-x)=|3x+5|+2x
b)|x^2-4|+(x-2)^2=0
c)|x+7|+|x+5|+|x+3|=2x
d)|3x+5|=5-3x
Tìm x biết
\(\frac{7^{x+2}+7^{x+1}+7^x}{57}=\frac{5^{2x}+5^{2x+1}+5^{2x+3}}{131}\)
tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
tìm x,biết
5.(x+7)-3.(2-x)
12(x-3)=5(x-1)+4
(-6).(x-7)+2(x+10)=x-18
7.(2x-1)-12(x-5)=3
|2x-1|=17
|8-3x|=14
tìm x,biết
5(x+7)-3(2-x)
12(x-3)=5(x-1)+4
(-6).(x-7)+2(x+10)=x-18
7(2x-1)-12(x-5)=3
|2x-1|=17
|8-3x|=14
Tìm x, biết:
a) 210 – 5.x = 200;
b) 210 : x – 10 = 20;
c) 210 – 5.( x – 10) =200;
d) (2x + l):7 = 22+32;
e) 450:[41–(2x–5)] = 32.5;
f) (5x – 39).7 + 3 = 80.
