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= -30 - 18y + 48y - 4 + 50
= -30 - 4 + 50 - 18y + 48y
= 16 + 30y
-30 - 18y + 36y - 3 + 50
-18y + 36y -30 -3 + 50
18y -33 + 40
18y + 13