Question

resolva as equaçãoes a 2x+1=12 b 10x+20=30-5x

Answer 1

a)

2x+1=12
2x=12-1
2x=11
x=11/2

b)

10x+20=30-5x
10x+5x=30-20
15x=10
x=10/15 (simplificando por 5)
x=2/3

Answer 2

a) 2x = 12-1    x=11÷2 = 5,5
b) 10x + 5x = 30 - 20   15x = 10  x= 10÷15  x= 0,6666666667