Question

encontre o valor desconhecido do x

a) x+4-6+15x-3x=19x-8+20-7
b) -5x-7+3x=-24x+5
c) 10x-4.(4+4x)=3(-2x+4)-20
por favor preciso disso amanha
ajuda!

Answer 1

A) x+4-6+15x-3x=19x-8+20-7
16x - 21x = - 4 + 6 -8+20-7
- 5x = 7
- x = 1,4 ---> . -1
X = - 1,4

B) -5x-7+3x=-2-4x+5
-2x + 4x = +5 + 7
2x = 12
x = 6

c) 10x-4.(4+4x)=3(-2x+4)-20
10x - 16 + 16x = -6x + 12 - 20
26x + 6x = 16 + 12 - 20
32x = 8
x = 0,25

Answer 2

a) x+4-6+15x-3x=19x-8+20-7
x+15x-3x-19x=-8+20-7-4+6
16x-22x=-19+26
-6x=7
x=7/-6
x=-1,16...

b) -5x-7+3x=-2-4x+5
-5x+7x=-2+12
2x=10
x=10/2
x=5

c) 10x-4(4+4x)=3(-2x+4)-20
10x-16-16x=-6x+12-20
10x-16x+6x=12-20+16
16x-16x=28-20
8