13. Simplify the following expressions a) 3x + 4y - 3x - 2y b) a + 2b - 4(-3c) c) 5xy - y^2 - 4xy - y^2 d) 12x^3 + 11y^3 - 10x^3 - 9y^3 + 3x^4 e) 6p x (-5) f) -3p x 4q x (-2p) g) 7r^2 s^2 x 3rs^3 h) 4(3x + 2y) - 5(3x - 4y)
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