10 + 20 = 50 - x 

30 = 50 - x 

x = 50 - 30

x = 20 

10 + 20 = 50 - x

30 = 50 - x

x = 20

10 + 90 = 10 + x

100 = 10 + x

x = 90

\(10+20=50-x\)

\(30=50-x\)

   \(x=50-30\)

   \(x=20\)

\(10+90=10+x\)

\(100=10+x\)

     \(x=100-10\)

     \(x=90\)

x=5

x=0 nha bn

chuẩn ko cần chỉnh nếu các bạn nghĩ giống mik thì ủng hộ mik nha

x=5&x=10

bài làm:

5+10=20-x

    15=20-x

      x=20-15

      x=5

10+40=50-x

      50=50-x

        x=50-50

        x=0

TÍCH MIK NHA BẠN

\(10+12=25-X\)

\(X=3\)

\(30-10=50-X\)

\(X=30\)

10 + 12 = 25 - x

22 = 25 - x

x = 3

30 - 10 = 50 - x

20 = 50 - x

x = 30

10+12=25-x

=>25-x=10+12

=>25-x=22

=>x=25-22

=>x=3

\(\frac{x+50}{x+61}=\frac{x-15}{x-10}\)

\(\Leftrightarrow\left(x+50\right).\left(x-10\right)=\left(x-15\right).\left(x+61\right)\)

\(\Rightarrow x^2-10x+50x-500=x^2+61x-15x-915\)

\(\Rightarrow40x-500=46x-915\)

\(\Rightarrow415=6x\Rightarrow x=\frac{415}{6}\)

` (3/4 +x) xx 50/100 = 8/10`

`( 3/4 + x) xx 1/2 = 4/5`

` 3/4 + x = 4/5 : 1/2`

` 3/4 + x = 4/5 xx2`

` 3/4 + x = 8/5`

` x = 8/5 - 3/4`

` x = 17/20`

Tìm x, biết:

( 3/4 + x ) x 50/100 = 8/10

( 3/4 + x ) = 8/10 : 50/100

( 3/4 + x ) = 8/5

x = 8/5 - 3/4

x = 17/20.

=>x+3/4=4/5:1/2=4/5x2=8/5

=>x=8/5-3/4=32/20-15/20=17/20

x + 10 x 2 = 50 x 2

x + 20 = 100

        x = 100 - 20

        x = 80

tìm x:

 x + 10 x 2 = 50 x 2

=>x+10x2=100

=>x+20=100

=>x=100-20

=>x=80

bấm **** nha 

x + 10 x 2 = 50 x 2

x + 10 x 2 = 100

x + 10 = 100 : 2

x + 10 = 50

        x = 50 - 10

        x = 40

ai nhanh mik k

`(x+10)^2-14=50`

`=>(x+10)^2=64`

$\to \left[ \begin{array}{l}x+10=8\\x+10=-8\end{array} \right.$

$\to \left[ \begin{array}{l}x=2\\x=-18\end{array} \right.$

Vậy x=2 hoặc x=-18