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x=4-2y...................1
substitusikan
3×+4y=10
3(4-2y)+4y=10
12-6y+4y=10
-2y=-2
y=1
subsstitusikan ke pers 1
x=4-2y
x=4-2(1)
x=2
Nilai dari
7x-5y
7(2)-5(1)=9