Question

Resolva as equações: a) 4(x+1)=12, b) 5(3-x)-4x=18,c) 9x-3(2x+2)=15
d) 2,5(x-2)-1,5x=1,e) 3,5x+8=2(x+2),f) 6(3x+2)-8=-2,g) -3(x-5)-2(2x+1)=-8 por favor me ajudem VALENDO 40 pontos

Answer 1

A)4X + 4 = 12 
4X = 12 - 4 = 8
X = 8/4 = 2

B)15 - 5X - 4X = 15 - 9X = 18
-9X = 18 - 15 = 3
X = 3/-9 = -1/3

C)9X -6X - 6 = 15
3X = 15 + 6 = 21
X = 21/3 = 7

D)2,5X - 5 - 1,5X = 1
X = 1 + 5 = 6

E)3,5X + 8 = 2X + 4
3,5X - 2X = 4 - 8
1,5X = -4
X = -4/1,5 = 2,67

F)18X + 12 - 8 = -2
18X = -2 -12 +8 = -6
X = -6/18 = -1/3

G)-3X + 15 -4X - 2 = -8
-3X - 4X = -8 -15 +2
-7X = -21
X = -21/-7 = 3

Answer 2

fica assim:
a)4x+4=12
4x=12-4
4x=8
X=8/4
X=2
b) 5(3-x)-4x=18
15-5X-4X=18
-9X=18-15
-9X=3*(-1)
X=-3/9
c)9x-3(2x+2)15
9X -6X - 6 = 15
3X = 15 + 6
3X= 21
X = 21/3
X= 7
d)2,5(x-2)-1,5x=1
2,5X - 5 - 1,5X = 1
X = 1 + 5
x= 6
e) 3,5x+8=2(x+2)
3,5X + 8 = 2X + 4
3,5X - 2X = 4 - 8
1,5X = -4
X = -4/1,5
X = -2,66
f) 6(3x+2)-8=-2
18X + 12 - 8 = -2
18X = -2 -12 +8
18x = -6
X = -6/18
x= -1/3
g) -3(x-5)-2(2x+1)=-8
-3X + 15 -4X - 2 = -8
-3X - 4X = -8 -15 +2
-7X = -21*(-1)
X = 21/7
x= 3
espero ter ajudado!