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=4x-6x+8y-10y-12+10
= -2x-2y-2
= (4 × x) + (4 × 2y) + (4 × -3) + (2 × -3x) + (2 × -5y) + (2 × 5)
= 4x + 8y - 12 - 6x - 10y + 10
= 4x - 6x + 8y - 10y - 12 + 10
= -2x - 2y - 2