12+3(-x+7)=-18
3(-x+7)=-18-12
3(-x+7)=-30
=>-x+7=-10
=>-x=-17
=>x=17
vậy x=17
12 + 3 . (-x + 7) = -18
=> 3 . (-x + 7) = -18 - 12
=> 3 . (-x + 7) = -30
=> -x + 7 = -30 : 3
=> -x + 7 = -10
=> -x = -10 - 7
=> -x = -17
=> x = 17
3 tìm x
a)4/9.x=1/9
b)x:-1/12=7/12
c)-5/14:x=-3/10
d)7/18.x-2/3=5/18
e)4/9-7/8.x=-2/3
f)1/6+-5/7:x=-7/18
Bài 3 : tìm x
a) 4/9 . x = 1/9
b) x : -1/12 = 7/12
c) -5/4 : x = -3/10
d) 7/18 . x - 2/3 = 5/18
e) 4/9 - 7/8 . x = -2/3
f) 1/6 + -5/7 : x -7/18
Cần gấp
x-75%x=-2,5
x\7=x-12\21
-3|x|=-2\3
0,5x-2\3x=7\12
x\8=-7\y=z\-18=-6\12
x-x/12+x/18 / 7-7/12+7/28=-12/21
/ ở chỗ sau x/18 là phần lớn
tìm x:
\(\dfrac{x-}{7-}\dfrac{\dfrac{x}{12}+}{\dfrac{7}{12}}\dfrac{\dfrac{x}{18}}{\dfrac{7}{18}}=\dfrac{-4}{7}\)
Tìm x: -12 +3(-x +7)= -18
-12+3(-x+7)=-18
-12+3.(-x+7)=-18
12+3.(-x+7)=-18
