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2x + 5y = 8
x + 5y = 2 -
1 x = 6
x = 6
x + 5y = 2
6 + 5y = 2
5y = -4
y = -4/5
nomor 7
x + 2y = 3
x + y = 5 -
1y = -2
y = -2
x + y = 5
x -2 = 5
x = 5 + 2
x = 7
silahkan di ikuti ya cara nya