a
[tex]7 \times x + 17 - 9 \times x = 13[/tex]
[tex]7x + 17 - 9x = 13[/tex]
[tex]7x - 9x = 13 - 17[/tex]
[tex] - 2x = - 4[/tex]
[tex]x = - 4 \div ( - 2) = 2[/tex]
b
[tex]3 \times x = 24 - 5 \times x[/tex]
[tex]3x = 24 - 5x[/tex]
[tex]3x + 5x = 24[/tex]
[tex]8x = 24[/tex]
[tex]x = 24 \div 8 = 3[/tex]
c
[tex]8 \times x - 20 = 4 \times x - 44[/tex]
[tex]8x - 20 = 4x - 44[/tex]
[tex]8x - 4x = - 44 + 20[/tex]
[tex]4x = - 24[/tex]
[tex]x = - 24 \div 4 = - 6[/tex]
d
[tex] - 15 - 7 \times x + 12 = - 12 \times x - 18 - 10 \times x[/tex]
[tex] - 15 - 7x + 12 = - 12x - 1 8- 10x[/tex]
[tex] - 7x + 12x + 10x = - 18 + 15 - 12[/tex]
[tex]15x = - 15[/tex]
[tex]x = - 15 \div 15 = - 1[/tex]
