Question

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Answer 1

Boa noite Maria

a) 

18 - 6 = 12

12*6 = 8x
8x = 72
x = 9

b)

8*9 = 2x²
x² = 72/2 = 36
x = 6

c)

x*(4x - 1) = 3x*(x + 1)

4x - 1 = 3x + 3
4x - 3x = 3 + 1
x = 4