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3x-2=4x+2 (pindah ruas jadi berlawanan, kumpulkan variabel yg sama)
3x-4x=2+2
-x=4
x=-4
x = 5
12x + x + 5y = 180
13 (kali) 5 + 5y = 180
5y = 180-65
y = 115:5
y = 23