9x - 7x+2x=?, y²+4y+5 - 3y+5+y²+y=?, -x³+7y - x³-y+8y-2x³=?, 5+b - 12-b-7+2b=?, 6a+10 - 8a+5-2a+5=?, 6x-3 - 4x-9+2x+6=?, 8y-5x+3 - 9y-2x-y-3x+3=?, 2a+2b+7 - 4a+3b+2-2a-b+5=?,

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