Question

calcule

a) 5(3x – 9 + 5) = 0

b) x + 4 = 12

c) x – 40 = 33
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Answer 1

Resposta:

a)15x - 45 + 25 = 0

15x -20 = 0

15x = 20

x = 20/15 = 4/3

b)x + 4 = 12

x = 12 -4

x = 8

c)x - 40 = 33

x = 33 + 40

x = 73