Question

2.(3x sobre 8 - 2) = 3. (1-7x sobre A) - x

Answer 1

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2*(3x/8 - 2) = 3*(1 - 7x/A) - x

2*(3x - 16)/8 = 3*(A - 7x)/A - x

(3x - 16)/4 = 3*(A - 7x)/A - Ax/A
(3x - 16)/4 = (3A - 21x - Ax)/A

A*(3x - 16) = 4*(3A - 21x - Ax)

3Ax - 16A = 12A - 84x - 4Ax

7Ax + 84x = 28A 

Ax + 12x = 4A

x*(A + 12) = 4A

x = 4A/(A + 12)