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2x + 3y = 26 ====> x 3 ====> 6x + 9y = 78
3x + 4y = 37 ====> x 2 ====> 6x + 8y = 74 -
y = 4
2x + 3y = 26 ====> x 4 ====> 8x + 12y = 104
3x + 4y = 37 ====> x 3 ====> 9x + 12y = 111 -
- x = -7
x = 7
x - y = 7 - 4 = 3