Question

tìm x bt

Answer 1

`a, x - (17-x) = x - 7`

`<=> x - 17 + x = x - 7`

`<=> x = 10`

`b, x - 43 = 35 - x - 48`

`x - 43 = -13 - x`

`2x = 30`

`x = 15`

`c, (x+5)+(x-9) = x+2`

`2x - 4 =x + 2`

`x = 6`

Answer 2

\(b,x-17+x=x-7\\ x-7=-17\\ x=\left(-17\right)+7\\ x=-10\\ b,x-43+x-35+48=0\\ 2x-30=0\\ 2x=30\\ x=15\\ b,x+5+x-9-x-2=0\\ x-6=0\\ x=6\)

Answer 3

`x-(17-x)=x-17`

`=>x-17+x=x-17`

`=>2x-17=x-17`

`=>2x-x=17-7`

`=>x=10`

` x-43=(35-x-48)`

`⇔ x-43= -x-13`

`⇔ 2x = -13+43`

`⇔2x=30`

`⇔x=15`

`(x+5)+(x-9)=x+2`

`<=>x+5+x-9=x+2`

`<=>x+x-x=2-5+9`

`<=>x=6`

Answer 4

đính chính là ý a là đpá án là 10 nhé