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3x +5Y - (-4-2x) = 5
3x + 5y + 4 + 2x = 5
5x + 5y + 4 = 5
5x +5y =1
3x - 2y + z = 13
3x - 2y + (-4 - 2x) = 13
3x - 2y - 4 - 2x = 13
x - 2y = 17
x = 2y + 17
5(2y + 17) + 5y = 1
10y + 85 + 5y = 1
15y = -84
y = -5,6
x = 2(-5,6) + 17
= -11,2 + 17
= 5,8
z = -4 -2(5,8)
= -4 - 11,6
= - 15,6