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-2x + y = -3 +
3y = 15
y = 15/3
y = 5
subtitusi ke
2x + 2y = 18
2x + 2(5) = 18
2x + 10 = 18
2x = 18 - 10
2x = 8
x = 4
2x +2(2x-3)=18
2x+4x-6=18
6x=18+6
x=24/6=4