Odpowiedź:
1.
a.
3(x+2) = 4 (opuszczasz nawias)
3x+6=4 | -6
3x=4-6
3x=-2 | : 3
x=[tex]-\frac{2}{3}[/tex]
b.
2x-3=10+5x | -5x
2x-5x = 10+4
-3x=14 | : (-3)
x: [tex]-\frac{14}{3}[/tex]
c.
6-3x=-4x+5x
6-3x = x | -6 | -x
-3x - x= -6
-4x = -6
x= [tex]\frac{3}{2}[/tex]
d.
2+3x = 9
2-9 = x3
3x = 7
x = [tex]\frac{7}{3}[/tex]
2.
a.
3 (x+5)< 4
3x + 15 < 4 |-15
3x < 4 - 15
3x < -11 | : 3
x < [tex]-\frac{11}{3}[/tex]
b.
2x - 4 < 7
2x < 7 + 4
2x < 11
x < [tex]\frac{11}{2}[/tex]
c.
3x - 6 ≥ 7 -4x
3x +4x ≥ 7+6
7x ≥ 13
x ≥ [tex]\frac{13}{7}[/tex]
