Question

Calcule o valor de x de modo que ;

A;2x + 3=15

B;7z - 1=13

C: 2x - 4= 3

D; 4x + 2 = -18

E; 5x - 2 = 7+6

F; 10x + 1 = -4-5

Answer 1

A)
2x + 3 = 15
2x = 15 - 3
2x = 12
x = 12/2
x = 6

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B)
7z - 1 = 13
7z = 13 + 1
7z = 14
z = 14/7
z = 2

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C)
2x - 4 = 3 
2x = 3 + 4
2x = 7
x = 7/2

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D)
 4x + 2 = - 18 
4x = - 18 - 2
4x = - 20
x = - 20/4
x = - 5

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E)
5x - 2 = 7 + 6
5x - 2 = 13
5x = 13 + 2
5x = 15
x = 15/5
x = 3

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F)
10x + 1 =  - 4 - 5
10x + 1 = - 9
10x = - 9 - 1
10x = - 10
x = - 10/10
x = - 1