`(15-x)+(x-12)=7-(-5+x)`

`=>15-x+x-12=7+5-x`

`=>3=12-x`

`=>x=12-3`

`=>x=9`

Vậy `x=9`

(15-x)+(x-12) = 7-(-5+x)

<=>15-x+x-12=7+5-x

<=>3=12-x

<=>x=12-3=9

(15-x)+(x-12) = 7-(-5+x)

<=> 15-x +x -12 = 7 +5 -x 

<=> x = 12 +12 -15

<=> x =9

Cho hỏi là dùng thì gì vậy ?

Help me 

P1: Two boys walked on the walkside and they saw something on that pavement. Not any things, just monet.

P2: One of the boys picked up the money and they suggested to buy something.

P3: They weren't know what to buy so they bought ice-cream

(Chúc bạn học tốt)

(8x-3)(3x+2)-(4x+7)(x+4) = (2x+1)(5x-1)-33

(24x²-9x+16x-6)-(4x²+7x+16x+28) = (10x²+5x-2x-1)-33

24x²+7x-6-4x²-23x-28 = 10x²+3x-1-33

20x²-16x-34 = 10x²+3x-34

<=> 20x²-16x = 10x²+3x

2x²-19x=0

2x(x-19)=0

=>\(\left[{}\begin{matrix}2x=0\Rightarrow x=0\\x-19=0\Rightarrow x=19\end{matrix}\right.\)

Không chắc lắm :)

\(=\left(x-y\right)\left(x+y\right)+11\left(x-y\right)=\left(x+y+11\right)\left(x-y\right)\)

Bạn chụp rõ nét đc ko ạ, mik đang ko có kính ở đây

Nam and Phong are best friend, but Minh is Phong neighbour. One day, three of them were in the garden that was very near to their house. Minh is a very shy and clever guy, so he was reading his book and sat on the grass while Nam and Phong were playing basketball. Both of them were a very successful . After a will, Phong threw the ball to Minh and invited him to join both of them. After Minh made up his mind, he joined them immediately. They taught him how to play basketball. And soon, they became best friends, and often plays basketball together.

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        Đây là ý kiến của mình nhé, có gì sai sót thì sửa giùm mình với !!!!!!!