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10y + 5 - 6y + 12 = 1
10y - 6y+ 5 + 12 -1 = 0
4y + 16 = 0
4y = -16
y = -16/4
y = -4
kalikan kedalam
10y + 5 - 6y + 12 = 1
4y + 17 = 1
pindahkan ruas
4y = 1 - 17
y = -16/4
y = -4