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5x-y=14 ×3 15x - 3y = 42
_ -
7 y= 32
y=4,5
5x-y=14
5x-4,5=14
5x=14-4,5
5x= 9,5
x= 9,5 : 5
x= 1,9
2x + 4y
2(1,9)+ 4(4,5)
3,8+18 = 21,8