Question

Resolva as expressões
A) 2x+3=9
B) -4x=32
C)10+x=9-2x
D) 3(x+6)-8(x+7)=-4.(3x+10)

Answer 1

A) 2x+3=9  ==>2x=6 ==>x=3

B) -4x=32 ==>x=-32/4=-8

C)10+x=9-2x ==>3x=-1 ==>x=-1/3

D) 3(x+6)-8(x+7)=-4.(3x+10) 
3x+18-8x-56=-12x-40

7x=-2

x=-2/7

Answer 2

a. 2x+3=9
2x=9-3
2x=6
x=6/3
×=2

b. -4x=32
-4x=32 .(-1)
4x=-32
x=-32/4

c. 10+x=9-2x
x+2x=9-10
3x=-1
x=-1/3

d. 3(x+6)-8(x+7)=-4.(3x+10
3x+18-8x+56=-12x+40
3x-8x+12x=40-18-56
7x=-34
x=-34/7