Question

Resolva as equações h) 8x - (x + 3) = 11 i) x/4 + 2 = 40 j) x - 2/3 = 10

Answer 1

h)8x - (x + 3) = 11 [=] 8x - x - 3 = 11 [=] 8x - x = 11 + 3 [=] 7x = 14 [=] x = 14/2 [=] x = 7

i) x/4 + 2 = 40 [=] x/4 = 40- 2 [=] x = 38 x 4 [=] x = 152

j) x -2/3 = 10 [=] x = 10 + 2/3 [=] x = 30/3 + 2/3 [=] x = 32/3

Answer 2

h)
8x - (x + 3) = 11
8x - x - 3 = 11
7x - 3 = 11
7x = 11 + 3
7x = 14
x = 14/7
x = 2

i)
x/4 + 2 = 40
(x + 4.2)/4 = 4.40/4
x + 8 = 160
x = 160 - 8
x = 152

j)
x - 2/3 = 10
(3x - 2)/3 = 3.10/3
3x - 2 = 30
3x = 30 + 2
3x = 32
x = 32/3