Question

resolva as equaçoes
a ) 2x + 5 = - 7 b ) 5 + 3x = 47
c ) 9x - 20 = 30 - x d ) x + 13 = 2x + 17

Answer 1

a) 2x= -12, x= -6
b)3x=42, x=42/3 = 14
c)9x=50, x= 50/9
d)2x - x=13-17, x=-4

Answer 2

a) 2x + 5 = -7
2x = -7 -5
2x = -12
x = -12/2
x = -6

b) 5 + 3x = 47
3x = 47 - 5
3x = 42
x =42/3
x = 14

c) 9x - 20 = 30 - x
9x + x = 30 + 20
10 x = 50
x = 50/10
x = 5

d) x + 13 = 2 x + 17
x - 2x = 17 - 13
-x = 4
x = 4/-1
x = -4