Question

resolva a equação a)3×+5×=72 b) -×-8×=18 c)5×+2×+4×=121 d)7×-2=5×+10 e)×+1=5-× f) 4×+6=6×+10​

Answer 1

Resposta:

a) x = 9

b) x = -2

c) x = 11

d) x = 6

e) x = 2

f) x = -2

Explicação passo a passo:

a) 3x + 5x = 72

8x = 72

x = $\frac{72}{8}$

x = 9

b) -x - 8x = 18

-9x = 18

-x = $\frac{18}{9}$

-x = 2 . (-1)

x = -2

c) 5x + 2x + 4x = 121

7x + 4x = 121

11x = 121

x = $\frac{121}{11}$

x = 11

d) 7x - 2 = 5x + 10

7x - 5x = 10 + 2

2x = 12

x = $\frac{12}{2}$

x = 6

e) x + 1 = 5 - x

x + x = 5 -1

2x = 4

x = $\frac{4}{2}$

x = 2

f) 4x + 6 = 6x + 10

4x - 6x = 10 - 6

-2x = 4

-x = $\frac{4}{2}$

-x = 2 . (-1)

x = -2