Question

resolva as equações
a)7(×-2)=5(×+3)
b)2(×-5)+4(×-1)=0
c)3(2×-1)=-2(×+3)
d)7(×-1)-2(×-5)=×-5

Answer 1

a) 7(x - 2) = 5(x + 3)
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29

x = 29/2

b) 2(x - 5) + 4(x - 1) = 0
2x - 10 + 4x - 4 = 0
2x + 4x = 10+ 4
6x = 14
x = 14/6

x = 7/3

c) 3(2x - 1) = - 2(x + 3)
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3

x = - 3/8

d) 7(x - 1) - 2(x - 5) = x - 5
7x - 7 - 2x + 10 = x - 5
7x - 2x - x = - 5 + 7 - 10
4x = - 8
x = - 8/4

x = - 2