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4x+3y =18 /x5
15x - 15y = 120 - 20x+ 15y = 90 (eliminasi)
35x = 210
x = 6
substitusi
5x -5y = 40
5.6 - 5y = 40
30-5y = 40
-5y = 10
y = -2
jdi 3x - 2y = (3.6) - (2.-2) = 18+4 =22