Question

calcule

A. 2 x + 5 + x + 7 = 18
B. 5 x - 91 = 4x - 77
C. 7 x + 1 = 5x - 7
D. 4 x + 5 = x + 20
E.
$3(x + 1) + 2(2x - 3) = 5( x - 1) + 8$
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Answer 1

Explicação passo-a-passo:

calcule

A. 2 x + 5 + x + 7 = 18

2x+x+5+7=18

3x+12=18

3x=18-12

3x= 6

x=6/3

x= 2

B. 5 x - 91 = 4x - 77

5x-4x= -77+91

x= +14

C. 7 x + 1 = 5x - 7

7x-5x= -7-1

2x= -8

x= -8/2

x= -4

D. 4 x + 5 = x + 20

4x-x= 20-5

3x= 17

x=17/3

E. 3(x + 1) + 2(2x - 3) = 5( x - 1) + 8

3x+3+4x-6=5x-5+8

3x+4x+3-6=5x+3

7x-3=5x+3

7x-5x= 3+3

2x= 6

x= 6/2

x= 3

espero ter ajudado !

boa noite !