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x = 16/5
3x^2 = 27
x^2 = 27/3
x^2 = 9
x = +/-√9
x = +/- 3 ó x1 = 3 ; x2 = -3
3y - 2 = 7 - y
3y + y = 7 + 2
4y = 9
y = 9/4
-8z + 4 = -5 + 10z
4 + 5 = 10z + 8z
9 = 18z
z = 9/18
z = 1/2