x-9=18 2x+3=5x-7 2(x-9)=3 7x-8=12x+4 3(x-5)=x-2(x+3)

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

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

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