Question

Resolva as equações
B)3×-10=120.
C)2x+3=23.
D)5×-10=125.
E)10-2×=×3
F)×-3=6+4×
G)16×-6-7×=15+2×
H)2(7×-8)=6(3×-4)
I)5×7=2x+28

Answer 1

b) 3x=120+10
3x=130
x=130/3

C)2x=23-3
2x=20
x=20/2 = 10

d)5x=125+10
5x=135
x=135/5 = 27

E)10-2×=×3
-2x-x3=-10
-2x-3x=-10
-5x=-10
x=-10/-5
x=2

F)×-3=6+4×
x-4x=6+3
3x=9
x=9/3
x=3

G)16×-6-7×=15+2×
16x-7x-2x=15+6
7x=21
x=21/7
x=3

H)2(7×-8)=6(3×-4)
14x-16=18x-24
14x-18x=-24+16
-4x=-8
x=-8/-4
x=2

I)5×7=2x+28
-2x-5x=28-7
-7x=21
x=21/-7
x=-3