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3x-5y=-4 dikali 5
》15x-9y=60 di kurangi
15x-25y=-20
16y=80
y=80/16
y=5
5x-3y=20
5x-3×5=20
5x-15=20
5x=20+15
x=35/5
x=7
nilai 6x-4y = 6×7 - 4×5
42-20 = 22