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4x-6y=42 kali 7
28x+8y=44
28x-42y=294
dikurang aja
50 y= - 250
y= -5
subsitusi ke salah satu
4x-6(-5)=42
4x+30=42
4x=42-30
4x=12
x=3
x+y=3+(-5)
=3-5=-2