Question

resolva as operações: a)7x+1=15 b)9x+10=20 c)6x+4=40 d)10x+10=19 e)4x+8=40 f)12x+4=52 g)3x+4x=70 h)9x+x+3x=169 i)20x+1=401 j)3x+7=40​

Answer 1

A) 7x + 1 = 15
7x = 15-1
7x = 14
X = 14/7
X = 2

B) 9x + 10 = 20
9x = 20 - 10
9x = 10
X = 10/9
X = 1,11111111

C) 6x + 4 = 40
6x = 40 - 4
6x = 36
X = 36/6
X = 6

D) 10x + 10 = 19
10x = 19 - 10
10 x = 9
X = 9/10
X = 0,9

E) 4x + 8 = 40
4x = 40 - 8
4 x = 32
X = 32/4
X = 8

F) 12x + 4 = 52
12x = 52 - 4
12x = 48
X = 48/12
X = 4

G) 3x + 4x = 70
7x = 70
X= 70/7
X = 10

H) 9x + x + 3x = 169
13x = 169
X = 169/13
X = 13

I) 20x + 1 = 401
20x = 401-1
20x = 400
X = 400/20
X = 20

J) 3x + 7 = 40
3x = 40-7
3x = 33
X = 33/3
X = 11