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3x+2y = 34.500 |x3|
4x+6y = 66.000
9x+6y = 103.500 (dikurang)
-5x = -37.500
x = -37.500/-5
x = 7.500
substitusikan nilai x=7.500
4x+6y=66.000
4(7500) +6y=66000
30.000 +6y = 66.000
6y = 66.000-30.000
6y = 36.000
y= 36.000/6
y= 6.000
maka 6x+6y=
6(7.500) + 6(6.000)
45.000 + 36.000
81.000