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5x - y = 14 x 2 10x - 2y = 28
--------------------------- +
13x = 26
x = 26/13 = 2
5x - y = 14
y = 5x - 14
= 10 - 14
= -4
4x - 3y = 4.2 - 3(-4)= 8+12 = 20