4x-3y=14 5x+y=27
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4x-3y=14 5x+y=27
4x-3y=14
15x+3y=81
19x=95
x=5
代入法求y 20-3y=14
3y=20-14
y=2
15x+3y=81
19x=95
x=5
代入法求y 20-3y=14
3y=20-14
y=2
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