Question

X-9=18

2x+3=5x-7

2(x-9)=3

7x-8=12x+4

3(x-5)=x-2(x+3)

Answer 1

X = 27

x = 3⅓

2(x-9)=3
2x - 18 = 3 | +18
2x = 21
x = 10½

7x-8=12x+4
5x = 4
x = ⅘ ( cztery piąte )

3(x-5)=x-2(x+3)
3x - 15 = x - 2x +6
4x = 21
x = 5¼

Answer 2

X-9=18 /+9
x=27

2x +3=5x-7 /-5x
-3x+3=-7 /-3
-3x=-10 /:(-3)
x=3,5

2(x-9)=3
2x-18=3 /+18
2x=21 /:2
x=10,5

7x-8=12x+4 /-12x
-5x-8=4 /+8
-5x=12 /:5
x=2,4

3(x-5)=x-2(x+3)
3x-15=x-2x+6
3x-15=-x +6 /+x
4x-15=6 /+15
4x=21 /:4
x=5,25

Answer 3

1. x-9=18
x=18+9
x=27
2. 2x-5=-7-3
-3x=-10 |/-3
1 i jedna trzecia
3. 2(x-9)=3
2x-18=3
2x=18+3
2x=21 |/2
x=10,5
4. 7x-8=12x+4
7x-12x=4+8
-5x=12 /-5
x=-2,4

5. 3(x-5)=x-2(x+3)
3x-15=x-2x-6
3x+2x-x=-6+15
5x=9 |/5
x=1,8

/ dzielone