a]
3(x + 6) = -5x - 6
3x + 18 = -5x - 6
3x + 5x = -6 - 18
8x = -24 / : 8
x = -3
b]
4(2x + 1) = 4x + 20
8x + 4 = 4x + 20
8x - 4x = 20 - 4
4x = 16 / : 4
x = 4
a.
[tex]3(x + 6) = - 5x - 6[/tex]
[tex]3x + 18 = - 5x - 6[/tex]
[tex]3x + 5x = - 6 - 18[/tex]
[tex]8x = - 24[/tex]
[tex]x = - 24 \div 8 = - 3[/tex]
b.
[tex]4(2x + 1) = 4x + 20[/tex]
[tex]8x + 4 = 4x + 20[/tex]
[tex]8x - 4x = 20 - 4[/tex]
[tex]4x = 16[/tex]
[tex]x = 16 \div 4 = 4[/tex]
