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4x-5y = -34 |x4| 16x - 20y = -136 +
31x = -186
x = -186/31
x = -6
3x + 4y = -10
3.-6 + 4y = -10
4y = -10 + 18
4y = 8
y = 8/4
y = 2
Nilai 8x + 3y = 8.-6 + 3.2 = -48 + 6 = -42