Question

Calcule o valor das equações: [2 (x-1) = 16] [7(x-2) = 5 ( x+3) [2(x-6) = -3(5+x)] [x\2 - x\4 = 1\2] [x\2 - x\4=5]

Answer 1

a) 2.(x - 1) = 16
2x - 2 = 16
2x = 16 + 2
2x = 18
x = 18/2
x = 9

b) 7.(x - 2) = 5.(x + 3)
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29/2

c) 2.(x - 6) = - 3.(5 + x)
2x - 12 = - 15 - 3x
2x + 3x = - 15 + 12
5x = - 3
x = - 3/5 ou - 0,6

d) x/2 - x/4 = 1/2
2x - x = 2
x = 2

e) x/2 - x/4 = 5
10x - 5x = 100
5x = 100
x = 100/5
x = 20