Question

a)x+3=23. b)x+5=100 c)3x+15x=100

Answer 1

Bem vamos lá...

a) x + 3 = 23
x = 23 - 3
x = 20

b) x + 5 = 100
x = 100 - 5
x = 95

c) 3x + 15x = 100
18x = 100
x = 100 ÷ 18
x = 5,55

Answer 2

$A)\\x+3=23\\\\x=23-3\\x=20\\\\ b)\\x+5=100\\x=100-5\\x=95\\\\ c)\\3x+15x=100\\18x=100\\\\x= \dfrac{100}{18}\\\\\\x= \dfrac{50}{9}$


Forte abraço!