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3(x - y) + 2(x + y) = 48
4(x - y) = x + 2y
3x - 3y = 2x + 2y = 48
4x - 4y - x - 2y = 0
5x - y = 48 |*(-6)
3x - 6y = 0
-30x + 6y = -288
3x - 6y = 0
------------------------- +
-27x = -288 /:(-27)
x = 32/3
5x - y = 48
y = 5x - 48 = 5 * 32/3 - 48 = 160/3 - 144/3
y = 16/3
{x = 32/3
{y = 16/3