Question

Calcule

A)5x+7= -23

B)4x7=2x-9

C)3x-48=0

Answer 1

a)
5x + 7 = - 23
5x = - 23 - 7
5x = - 30
x = - 30/5
x = - 6
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
(mais)

4x + 7 = 2x - 9
4x - 2x = - 9 - 7
2x = - 16
x = - 16/2
x = - 8
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(menos)

4x - 7 = 2x - 9
4x - 2x = - 9 + 7
2x = - 2
x = -2/2
x = - 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c) 
3x - 48 = 0
3x = 48
x = 48/3
x = 16