Question

Resolva as equações a seguir.

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) 7x-14=5x+15
7x-5x=15+14
2x=29
x=29/2
x=14,5.

b)2x-10+4x-4=0
2x+4x=0+10+4
6x=14
x=14/6
x=2,33

c)6x-3=-2x-6
6x+6x+2x=3
14x=3
x=14/3
x=4,66

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

Answer 2

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

B) 2.(x-5)+4.(x-1)=0
2x-10+4x-4=0
2x+4x=0+10+4
6x=14
x=14/6=2,33

C) 3.(2x-1)=-2.(x+3)
6x-3=-2x+6
6x+2x=6+3
8x=9
x=9/8=1,125

D) 7.(x-1)-2.(x-5)=x-5
7x-7-2x-10=x-5
7x-2x-x=-5+7+10
7x-3x=12
4x=12
x=12/4=3