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(-) 3a + 2c + 5b + 2c = 3a + 4c + 5b
(-) 2c * 5g * a = 10acg (NOTE: *=kali)
(-) 3a + 6c - 3b = 3a + 6c - 3b
khusus pertambahan dan pengurangan, variabel HARUS sama.