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3x + 2y + 1 = 4x + 4y
x + 2y = 1
5x + 6y - 7 / x + y = 2
5x + 6y - 7 = 2x + 2y
3x + 4y = 7
3x + 6y = 3 [(x+2y =1) x3 ]
3x + 4y = 7 -
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2y = -4
y = -2
3x + 6y = 3
3x + -12 = 3
3x =15
x = 5