Odpowiedź :
Odpowiedź:
[tex]x + 13 = 20 \\ x = 20 - 13 \\ x = 7[/tex]
[tex] - 9 + x = 12 \\ x = 12 + 9 \\ x = 21[/tex]
[tex]2x + 9 = 15 \\ 2x = 15 - 9 \\ 2x = 6 \\ x = 6 \div 2 \\ x = 3 [/tex]
[tex] \frac{1}{3} y - 3 = 7 \\ \frac{1}{3} y = 7 + 3 \\ \frac{1}{3} y = 10 \\ y = 10 \times 3 \\ y = 30[/tex]
[tex]7x - 2 = 26 \\ 7x = 26 + 2 \\ 7x = 28 \\ x = 28 \div 7 \\ x = 4[/tex]
[tex]4x - 6 = 30 \\ 4x = 30 + 6 \\ 4x = 36 \\ x = 36 \div 4 \\ x = 9[/tex]
[tex] \frac{1}{5} x - 2 = 4 \\ \frac{1}{5} x = 4 + 2 \\ \frac{1}{5} x = 6 \\ x = 6 \times 5 \\ x = 30[/tex]
[tex]y - 3 + y = 5 \\ 2y - 3 = 5 \\ 2y = 5 + 3 \\ 2y = 8 \\ y = 8 \div 2 \\ y = 4[/tex]
[tex]5x - 4x + 1 = 2 \\ x + 1 = 2 \\ x = 2 - 1 \\ x = 1[/tex]
[tex] \frac{1}{2} x + 1 - x = - 4 \\ - \frac{1}{2} x + 1 = - 4 \\ - \frac{1}{2} x = - 4 - 1 \\ - \frac{1}{2} x = - 5 \\ x = ( - 5) \times ( - 2) \\ x = 10[/tex]
Odpowiedź:
X=20-13
X=7
X=12+9
X=21
2x=15-9
2x=6
X=3
1/3y=7+3
1/3y=10
Y=30
7x-2=26
7x=28
X=28:7
X=4
4x-6=30
4x=30+6
4x=36
X=36:4
X=9
1/5x-2=4
1/5x=4+2
1/5x=6
X=30
Y-3+y=5
2y=5+3
2y=8
y=4
5x-4x+1=2
X+1=2
X=2-1
X=1
1/2x+1-x=-4
-1/2x=-4-1
-1/2x=-5
X=10