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4x - 3y = 13 | x3 | 12x - 9y = 39 ..... dikurangkan
jadi
16y -(-9y)= 264-39
25y=225
y=9
3x + 4y = 66
3x + 4(9)= 66
3x+36=66
3x=66-36
3x=30
x=10