-1/5x-1/5x =5/3+2/5
x.(-1/5-1/5) =31/15
x .(-2/5) = 31/15
x = 31/15:(-2/5)
x =-31/6
nhanh tl giúp mình, mình cần gấp lắm 
x+3/15=1/3
-5 .(x+1/5)-1/2.(x-2/3)=3/2x-5/6
x.hỗn số 6 và 2/7 +3/7. hỗn số 2 và 1/5-3/7 =-2
-1/5 x - 2/5 = 5/3 + 1/5 x
Tìm x biết:
-2/5.x+4/5.x-1/2+3/5.x-1
1) (6 x 5^2 -13x7) x2 - 2^3 x (7-3) ^2
2) [(95+ 5^2 :5) : 2^2 +180]-2^2 x 10^2
3) 2^4 : 2^3 + 5^3 : 5^2 x 2^4 -3 x 2^5
GIÚP MK VS NHÉ
tim x ,a,x+1/2:(-3/4)=-5/4
b,1-(5 3/8 +x-7 5/24):16 2/3=0
1/5 . 2^x + 1/3 . 2^x+1 = 1/5 . 2^7 + 1/3 . 2^8
a) 3/4-2.|2x-2/3|=2
b) -5.(x+1/5)-1/2.(x-2/3)=3/2x-5/6
Bài 1: Tìm x , biết:
1) x - 2 = -6 12) 3 . | x - 1 | - 5 = 7
2) -5 . x - ( -3 ) = 13 13) -12 . ( x - 5 ) + 7 . ( 3 - x ) = 5
3) 15 - ( x - 7 ) = -21 14) ( x - 2 ) . ( x + 4 ) = 0
4) 3 .x + 17 = 2 15) ( x - 2 ) . ( x + 15 ) = 0
5) 45 - ( x - 9 ) = -35 16) ( 7 - x ) . ( x + 19 ) = 0
6) ( -5 ) + x = 15 17) -5 < x < 1
7) 2 . x - ( -17 ) = 15 18) | x | < 3
8) | x - 2 | = 3 19) ( x - 3 ) . ( x - 5 ) < 0
9) | x - 3 | - 7 = 13 20) 2 . x2 - 3 = 29
10) 72 - 3 . | x + 1 | = 9 21) -6 . x - ( -7) = 25
11) 17 - ( 43 - | x | ) = 45 22) 46 =- ( x - 11 ) = -48
Tìm x biết
a,(3x-1).1/2x+5=0
b,-5.(x+1/5)-1/2.(x+3/5)=-x+1/5
c,2|1/2x-1/3|-3/2=1/4
d,|20/9-x|=1/12+1/20+1/30+1/42+1/56+1/72
e,1/2.3.x+1/3.4.x+1/4.5.x+...+1/49.50.x=1
MÌNH ĐANG CẦN GẤP.CẢM ƠN CÁC BẠN ĐÃ GIÚP!!!!