Question

me ajudem por favor
A)8(10X+5)=4(2X+4)
B)3(7X+5)=-4(X-10)
C)8(2X+5)=7(2X+10)

2
D)X-3X-4=0

Answer 1

a) 8(10x+5)=4(2x+4)
80x+40=8x+16
80x-8x=16-40
72x=-24
x=-24
----
72
x=3

b) 3(7x+5)=-4(x-10)
21x+15=-4x-40
21x+4x=-40-15
25x=-55
x=-55
----
25

c) 8(2x+5)=7(2x+10)
16x+40=14x+70
16x-14x=70-40
2x=30
x=30
----
2
x=15

d) x-3x-4=0
x-3x=0+4
-2x=4 .(-1)
2x=4
x=4
---
2
x=2