Resposta:
m) 3x = 15
[tex]3x = 15 \\ \\ x = \frac{15}{3} \\ \\ x = 5[/tex]
n) 2x = 10
[tex]2x = 10 \\ \\ x = \frac{10}{2} \\ \\ x = 5[/tex]
o) 3.r = -9
[tex]3.r = - 9 \\ 3r = - 9 \\ \\ r = - \frac{9}{3} \\ \\ r = - 3[/tex]
p) 2x - 2 = 12 - 5x
[tex]2x - 2 - 12 + 5x = 0 \\ 7x - 14 = 0 \\ 7x = 14 \div (7) \\ x = 2[/tex]
q) 3x - 13 = 8
[tex]3x - 13 - 8 = 0 \\ 3x - 21 = 0 \\ 3x = 21 \div (3) \\ \\ x = 7[/tex]
r) 4x - 9 = 23
[tex]4x - 9 - 23 = 0 \\ 4x - 32 = 0 \\ 4x = 32 \div (4) \\ x = 8[/tex]
s) 7x - 33 = -12
[tex]7x - 33 + 12 = 0 \\ 7x - 21 = 0 \\ 7x = 21 \div (7) \\ x = 3[/tex]
t) 33+ x = 5 - 3x
[tex]33 + x - 5 + 3x = 0 \\ 6x + 28 = 0 \\ 6x = - 28 \\ \\ x = - \frac{28}{6} \div (2) \\ \\ x = - \frac{14}{3} [/tex]
u) 2x = 14
[tex]2x = 14 \\ \\ x = \frac{14}{2} \div (2) \\ \\ x = 7[/tex]
V) 7x = -21
[tex]7x = - 21 \\ \\ x = - \frac{21}{7} \\ \\ x = - 3[/tex]
w) 4x = -12
[tex]4x = - 12 \\ \\ x = - \frac{12}{4} \\ \\ x = - 3[/tex]
x) 35x = -105
[tex]35x = - 105 \\ \\ x = - \frac{105}{35} \\ \\ x = - 3[/tex]
