Question

Determine o valor das equacoes:
f) 2.(x+5)-3.(2x+6)=0
g) 30=10.(5-h)+4h
h) 4w-8w+9=w-5
i) 3x/5 + 1/2 = 3/4
j) 2.(x-1)/3=5

Answer 1

f) 2x + 10 - 6x + 18 = 0
2x - 6x + 10 +18 = 0
- 4x + 28 = 0
-4x = - 28
x = (-28) ÷ 4
x = -7

g) 30 = 50 - 10h + 4h
30 = 50 - 6h
6h = 50 - 30
6h = 20
h = 20 ÷ 6
h = 3.333

h) 4w + 9 = w - 5
4w - w = - 5 + 9
3w = + 4
w = 4 ÷ 3
w = 1.3

i) 12x/20 + 10/20 = 15/20
22x/20 = 15/20
22x/20 - 15/20
7x/20 (..)

j) 2x - (-2) ÷ 3 = 5
2x + 2 ÷ 3 = 5
2x ÷ 3 = 5 - 2
2x = 3 × 3
2x = 6
x = 6 ÷ 2
x = 3