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4y+2 = 2y+6 4y-2y = 6-2 2y = 4 y = 2
9x + 2 = 12x + 14 -3x = 12 x = -4
6x = 32 - 4y and 4y - 8 = 6x so 32 - 4y = 4y - 8 ie 40 = 8y so y = 5 and x = 2
3x3 - x2y + 12x - 4y = x2*(3x - y) + 4*(3x - y) = (x2 + 4)*(3x - y)
y=2