Because (x plus 3x) is 4x, and (-5 + 11) is 6.
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Collect like terms: 3x - x + 4x - 4y + 6y + 2 = 6x + 2y + 2
x=12
-5 + -3x + -x + 16-4x + 11
7x - 2 = 4x + 9 3x - 2 = 9 3x = 11 x = 11/3
2x + 3 + 3x = x + 11 5x + 3 = x + 11 4x + 3 = 11 4x = 8 x = (8/4) x = 2